How Long Should I Go in the Sauna for Recovery?
How long should I go in the sauna? Ten to 20 minutes after training is the honest default for most people. That range is where the trials cluster, and it is also the safety ceiling in the standard guidance: Harvard Health advises staying in no more than 15 to 20 minutes. But the honest answer has a catch. No trial has tested sauna duration as a proper dose, so the number changes with the goal. A 10 minute infrared session helped athletes recover jump performance over six weeks. A 35 minute infrared session eased soreness the next morning. And the only protocol that measurably improved endurance performance used about 30 minutes in a hot traditional sauna, several times a week for three weeks. Duration is not one number. It is a ladder, and where you stand on it depends on what you are recovering for.
What does recovery actually mean here?
Recovery is three different outcomes wearing one name, and the sauna evidence splits between them. Muscle soreness is how stiff and tender you feel a day or two after training. Performance recovery is whether you can jump, sprint or lift as well the next day. Adaptation is whether the training makes you fitter or stronger over weeks. A sauna can help one of these and do nothing for another, and the trials show exactly that pattern.
The clearest summary we have is a 2025 systematic review in Sports Medicine Open. It gathered 14 studies with a total of 194 participants, all testing whole body heat after exercise, including saunas, and compared them with passive rest. Of the nine studies that looked at acute recovery, four found a benefit, four found no effect and one found worse performance afterwards. The quality of the evidence was rated low to moderate, and the authors concluded that no definitive claims can be made yet about post exercise heat and recovery. That is the frame for everything below: promising in places, thin overall, and no single dose that the science has settled on.
What the trials actually tested
Four trials carry most of the weight, and they tested very different durations, so it helps to see them side by side before anyone quotes a single number.
The endurance result comes from Scoon and colleagues in 2007. Six competitive male distance runners added post training sauna sessions to three weeks of normal training: about 31 minutes at around 90 degrees, on roughly 13 occasions. Compared with a control period, their time to exhaustion at 5 kilometre race pace rose by 32 percent, which the authors estimated as about a 1.9 percent improvement in an actual 5 kilometre time trial. Plasma volume rose by 7.1 percent and red cell volume by 3.5 percent. It is the strongest sauna performance result ever published, and also the smallest: six runners, no blinding, and a protocol most people would find punishing.
The soreness result comes from Ahokas and colleagues in 2023. After a hard resistance session, athletes took either a 35 minute infrared sauna at 50 degrees or passive rest. Fourteen hours later, the sauna group had lost less countermovement jump height and reported less muscle soreness. Sprint recovery did not improve. So the session helped how recovered the athletes felt and how high they could jump, but not how fast they could run.
The longer term result comes from the same research group in 2025. Forty female team sport athletes followed a six week strength and power programme, two to three sessions a week. Half used a 10 minute infrared sauna at 50 degrees after training, three times a week. The sauna group improved loaded jump height and peak power more than the control group, and soreness between sessions was lower. Muscle growth was no different between the groups. Ten minutes was enough to move recovery and power, and it did not add muscle on its own.
The cautionary result comes from Skorski and colleagues in 2019. Twenty competitive swimmers and triathletes did an intensive training session, then either three rounds of 8 minutes in a sauna at 80 to 85 degrees, or a placebo rest condition. The next morning they swam four 50 metre all out sprints. After the sauna they were slower by 1.69 seconds overall, while after the placebo they were faster by 0.66 seconds, a difference the authors called relevant for competitive swimmers. They also reported feeling more stressed after the sauna. The authors advised caution with post exercise sauna when hard training or competition is scheduled the next day.
Read together, the four trials say this: heat after training can help soreness and jump recovery, it can build endurance over weeks at a much longer dose, and it can hurt next day sprint performance if the session is long and hot and the next day matters. None of them tested a range of durations against each other, so none of them can tell you the best length. They can only tell you what each length did.
How long should I go in the sauna? The duration ladder
With no dose response trial to lean on, the practical answer is a ladder built from the trial doses and the safety guidance, starting short and climbing only when the goal justifies it.
First time, or new to heat: 5 to 10 minutes. Start at the bottom. Sit on a lower bench where it is cooler, leave the moment you feel dizzy or nauseous, and cool down gradually afterwards. Two or three short sessions teach you how your body responds far better than one long one that leaves you flattened.
Standard recovery session: 15 to 20 minutes. This is the default for most people after training, and it is the ceiling in the guidance rather than a target to beat. Harvard Health advises staying in no more than 15 to 20 minutes, and Cleveland Clinic gives the same range, with beginners starting shorter. Fifteen to 20 minutes in a traditional sauna at 80 to 100 degrees is a real heat dose: your pulse rises by 30 percent or more and you can lose around a pint of sweat. It is also the length that sits inside every trial range for general recovery, so it is the safest place to start if you want one number.
Infrared sauna: 10 to 35 minutes. Infrared rooms run much cooler, around 50 degrees in the trials, so the clock runs longer. Ten minutes after training was the dose in the six week athlete study. Thirty five minutes was the dose in the single session soreness study. Do not carry those numbers across to a traditional sauna: 35 minutes at 90 degrees is a different exposure from 35 minutes at 50 degrees, and only the second has trial support.
Endurance protocol: about 30 minutes, several times a week. This is the Scoon dose, and it is the only one with a measured performance gain attached. It means roughly 30 minutes at around 90 degrees after training, three to five times a week, for two to three weeks, with the gains building over the first one to two weeks. Treat it as a training block, not a daily habit: it is a large heat load on top of training, it demands careful hydration, and it comes from six runners, so it is a protocol to test on yourself, not a prescription.
Rounds rather than one long sit. In Finnish practice a session is usually two or three rounds of 5 to 20 minutes, with a cool down between rounds, rather than a single unbroken stretch. That structure matters more than the headline total: stepping out, cooling down and deciding whether to go back in is how you stay inside your tolerance. If you are counting total time, count the time in the heat, not the breaks.
How often should you go?
Frequency has better long term data than duration, but it is observational, so it describes a habit rather than prescribing one. The Kuopio Ischaemic Heart Disease study followed 2,315 middle aged Finnish men for a median of 20.7 years. Compared with men who used a sauna once a week, men who bathed four to seven times a week had a 63 percent lower risk of sudden cardiac death, about half the rate of fatal coronary heart disease and fatal cardiovascular disease, and a 40 percent lower risk of death from any cause. Men bathing two to three times a week sat in between. Longer sessions were also linked to lower rates of sudden cardiac death and fatal heart disease, though not to lower all cause mortality. The researchers adjusted for age, smoking, cholesterol, blood pressure, diabetes, alcohol and physical activity.
None of that proves sauna use causes the difference. The men chose their own habits, and frequent bathers may simply have been healthier in ways the adjustments did not catch. The four to seven sessions a week group was only 201 men out of 2,315. No trial has ever assigned people a sauna schedule and measured what happened, so frequency is not a prescription. What it does tell you is that the people with the best outcomes in the best long term data were bathing several times a week, in sessions long enough to be real heat exposure, and they were doing it for years, not weeks.
For recovery specifically, a practical starting point is two to four sessions a week after your hardest training days, with rest days in between. Daily use is fine for most healthy adults if sessions stay short and hydration is handled, but there is no recovery evidence that daily long sessions add anything over a few good sessions a week, and the heat load adds up. If your sleep or next day performance starts slipping, cut the frequency before you cut the training.
Traditional sauna or infrared sauna?
The two are not interchangeable, and the trial doses prove it. A traditional Finnish sauna is dry heat at 80 to 100 degrees with low humidity, usually in rounds of 5 to 20 minutes. An infrared sauna heats the body directly at much lower air temperatures, around 50 degrees in the trials, which is why sessions of 10 to 35 minutes are comfortable. The recovery trials split neatly: the endurance gain came from a traditional sauna at around 90 degrees, while the soreness and jump recovery gains came from infrared at 50 degrees.
That split means you should match the type to the trial, not mix the numbers. If you want the soreness and jump recovery evidence, use infrared at around 50 degrees for 10 to 35 minutes. If you want the endurance protocol, use a traditional sauna at around 90 degrees for about 30 minutes. If your gym only has one type, use the dose that was tested for that type. There is no trial comparing the two head to head for recovery, so claims that one is better than the other are marketing, not evidence.
When a sauna can slow your recovery down
Heat is a stressor, and stressors add up. The swimmer study is the clearest warning: a long, hot sauna after an already intensive session left athletes slower and more stressed the next morning. The same logic applies the day before a competition or a testing day. If tomorrow matters, keep the sauna short, skip it, or move it to after the event.
Dehydration is the other cost. A short sauna session can cost you around a pint of sweat, and that fluid comes on top of what training already took. A sauna after a hard session without rehydration is not recovery, it is a second workout for your circulation. Drink before you go in, drink two to four glasses of water afterwards, and eat something with salt if you trained hard.
There is one comparison worth making with cold therapy. Cold water immersion after lifting blunts muscle growth: a 12 week trial found smaller strength and muscle gains in lifters who immersed after sessions. Heat does not appear to carry the same penalty. In the six week infrared study, muscle growth was no different between the sauna group and the control group, and the sauna group actually improved power more. That is a reason to prefer heat over cold after lifting days, but it is not a reason to treat sauna as a muscle builder. It did not add muscle. It just did not get in the way.
A practical protocol you can test on yourself
Because no universal dose exists, the honest approach is a two week self experiment with a fixed protocol and something measured. Here is a starting version.
Finish training and cool down for five to 10 minutes first. Do not go straight from a hard set into a hot room with your heart rate still high. Drink a glass of water, then go in for 10 to 15 minutes in a traditional sauna, or 10 to 20 minutes in an infrared sauna. Sit on a lower bench if you are new. Step out if you feel dizzy, nauseous or unwell, whatever the timer says. Cool down gradually for a few minutes, then drink two to four glasses of water and eat. Do this two to four times a week, after your hardest sessions, for two weeks.
Track three things: soreness out of 10 the next morning, sleep quality, and one performance marker you can repeat, such as jump height, a short sprint, or how the same weights feel. If soreness falls and performance holds, the dose is working for you. If sleep worsens or next day performance drops, shorten the session or drop a day. After two weeks you will know more about your response than any article can tell you, because the trials were small and you are not their average participant.
Who should check first, and the warning signs
Saunas are safe for most healthy adults, but heat puts real demands on the heart and circulation. A 2018 review in Mayo Clinic Proceedings lists unstable angina, a recent heart attack, uncontrolled high blood pressure, decompensated heart failure and severe aortic stenosis as reasons not to use a sauna, while noting that most people with stable heart disease can use one safely. Harvard Health advises anyone with uncontrolled high blood pressure or heart disease to check with their doctor first, and warns that blood pressure responses to heat are unpredictable: it rises in some people and falls in others.
Do not take a sauna when you are ill, and avoid alcohol before and after: it impairs sweating and raises the risk of overheating. If you are pregnant, NHS guidance notes there is little research on sauna use in pregnancy and advises that you may choose to avoid saunas, hot tubs and steam rooms because of the risks of overheating, dehydration and fainting, particularly in the first 12 weeks. Speak to your midwife or GP first.
The warning signs are simple and non negotiable: dizziness, nausea, headache, a racing heart that does not settle, confusion, or feeling unwell in any way. Leave immediately, cool down, drink water, and get help if symptoms do not pass quickly. The timer never matters more than the symptoms.
The bottom line
How long should you go in the sauna for recovery? Start with 10 to 20 minutes after training, in two or three rounds if you like, two to four times a week. Use 10 to 35 minutes in an infrared sauna, where the trials ran longer at lower temperatures, and reserve the 30 minute traditional sauna for a deliberate endurance block, not a daily habit. Skip the long hot session the night before a competition. And remember what the evidence actually is: a handful of small trials, a mixed systematic review, and one large observational cohort. That is enough to justify a sensible protocol and a two week test on yourself. It is not enough to justify a magic number, and anyone selling you one is guessing.
Frequently asked questions
How long should I go in the sauna for recovery?
How long should I go in the sauna? Ten to 20 minutes after training is the honest default for most people. It sits inside every trial range for general recovery and under the 15 to 20 minute ceiling in the safety guidance. Longer sessions only make sense for a specific goal, such as the 30 minute endurance protocol.
Is 15 minutes in a sauna enough?
Yes, for a standard recovery session. Fifteen minutes sits inside the trial doses and the guidance range, and it was close to the session length in the athlete studies that found better jump recovery and less soreness. More time is not automatically more recovery.
How long should a beginner stay in a sauna?
Five to 10 minutes for the first few sessions, on a lower bench where it is cooler. Build up by a few minutes at a time over several sessions, and leave immediately if you feel dizzy or nauseous.
Should I sauna every day after training?
You can if you are healthy and sessions stay short, but the recovery evidence points to two to four sessions a week after hard training days, and daily long sessions add heat stress without proven extra benefit. If sleep or next day performance slips, cut back.
Is a sauna better than an ice bath for recovery?
They do different jobs. Ice baths have stronger evidence for easing muscle soreness, while sauna sessions preserved jump performance and did not blunt muscle growth the way cold water immersion can after lifting. Many athletes use both on different days.
Can I sauna the night before a competition?
Better not to take a long hot session. In a trial of 20 swimmers and triathletes, three rounds of 8 minutes at 80 to 85 degrees left them slower in sprint tests the next morning and feeling more stressed. Keep any pre competition session short, or skip it.
Sources
- Ahokas EK et al. Effects of Post-Exercise Heat Exposure on Acute Recovery and Training-Induced Performance Adaptations: A Systematic Review. Sports Medicine Open, 2025;11:106. DOI: 10.1186/s40798-025-00910-0
- Scoon GSM et al. Effect of post-exercise sauna bathing on the endurance performance of competitive male runners. Journal of Science and Medicine in Sport, 2007;10(4):259-262. PMID: 16877041
- Ahokas EK et al. A post-exercise infrared sauna session improves recovery of neuromuscular performance and muscle soreness after resistance exercise training. Biology of Sport, 2023;40(3):681-689. DOI: 10.5114/biolsport.2023.119289
- Ahokas EK et al. Effects of repeated use of post-exercise infrared sauna on neuromuscular performance and muscle hypertrophy. Frontiers in Sports and Active Living, 2025;7:1462901. DOI: 10.3389/fspor.2025.1462901
- Skorski S et al. Effects of postexercise sauna bathing on recovery of swim performance. International Journal of Sports Physiology and Performance, 2019;15(7):934-940. DOI: 10.1123/ijspp.2019-0333
- Laukkanen T et al. Association between sauna bathing and fatal cardiovascular and all-cause mortality events. JAMA Internal Medicine, 2015;175(4):542-548. DOI: 10.1001/jamainternmed.2014.8187
- Laukkanen JA, Laukkanen T, Kunutsor SK. Cardiovascular and other health benefits of sauna bathing: a review of the evidence. Mayo Clinic Proceedings, 2018;93(8):1111-1121. DOI: 10.1016/j.mayocp.2018.04.008
- Roberts LA et al. Post-exercise cold water immersion attenuates acute anabolic signalling and long-term adaptations in muscle to strength training. Journal of Physiology, 2015. DOI: 10.1113/JP270570
- Harvard Health Publishing. Saunas and your health. https://www.health.harvard.edu/staying-healthy/saunas-and-your-health
- NHS. Pregnancy: saunas, hot tubs and steam rooms guidance.
Related reading
