Most healthy adults should aim for 15 to 20 minutes in a traditional dry sauna, with beginners starting at just 5 to 10 minutes. The right duration depends on the type of sauna you’re using, your experience level, and how your body responds to heat. There’s no single magic number, but there are clear guidelines worth following.
Traditional Dry Sauna: 15 to 20 Minutes
A traditional Finnish-style sauna operates between 150 and 195°F and should never exceed 212°F. At these temperatures, 15 to 20 minutes is the sweet spot for experienced users. That’s long enough for your core temperature to rise, your heart rate to increase, and your blood vessels to dilate, but short enough to avoid overheating.
If you’re brand new to saunas, the American College of Sports Medicine and the American Sauna Society both recommend starting with 5 to 10 minutes per session. From there, you can gradually add a few minutes each visit as your body adapts. The Finns, who invented the practice, keep it even simpler: leave when you feel hot enough. That instinct is surprisingly reliable once you learn to trust it.
Infrared Saunas Allow Longer Sessions
Infrared saunas heat your body directly rather than heating the air around you. They operate at lower temperatures, typically between 120 and 150°F, which means you can comfortably stay in longer. Experienced users often sit for 30 to 45 minutes per session.
If you’re new to infrared saunas, a reasonable ramp-up looks like this:
- First session: 10 to 15 minutes
- First week: 15 to 20 minutes per session
- Second week: 20 to 25 minutes per session
- Third week onward: 25 to 30 minutes, eventually working up to 45
Because the heat feels gentler, it’s easy to lose track of time in an infrared sauna. Setting a timer is a good habit, especially early on.
Steam Rooms: Same Ballpark, Different Reason
Steam rooms run at much lower temperatures (around 110 to 120°F) but at near 100% humidity. That humidity makes it harder for sweat to evaporate, which is your body’s main cooling mechanism. The result: you overheat faster than you’d expect given the lower temperature. Experts recommend capping steam room sessions at 15 to 20 minutes, the same range as a dry sauna but for different physiological reasons.
What the Research Says About Benefits
Large population studies involving thousands of people consistently find that regular sauna users have lower rates of heart disease. That sounds compelling, but researchers have spent over a decade trying to figure out whether saunas actually cause those benefits or whether sauna-goers simply tend to have healthier lifestyles overall.
The controlled trials paint a more modest picture. A review published in the American Journal of Preventive Cardiology analyzed 20 randomized trials of passive heating (saunas, hot baths, and hot yoga) and found no improvement in cholesterol, inflammation, or arterial stiffness. The one possible exception was blood pressure: the combined data showed a drop of about 4 points in systolic blood pressure, which is meaningful but modest. For context, that’s roughly half the effect of starting a regular walking routine.
None of this means saunas are useless. The relaxation, improved sleep, and muscle recovery that many people experience are real and valuable. But if you’re hoping to unlock dramatic cardiovascular benefits by hitting a precise number of minutes, the science doesn’t support that level of specificity yet.
Hydration Before, During, and After
You lose a surprising amount of fluid during a sauna session, sometimes more than a pound of water weight in 20 minutes. The general recommendation is to drink at least 350 milliliters (about 12 ounces) of water per 30 minutes of sauna time. In practical terms, that means drinking a full glass of water before you go in, sipping water if your sauna allows it, and drinking another glass or two afterward.
Plain water works fine for most people. If you’re doing longer infrared sessions or multiple rounds, adding a pinch of salt or drinking something with electrolytes helps replace what you’re sweating out. Signs you haven’t hydrated enough include dizziness, a headache that starts during or shortly after your session, or feeling unusually fatigued.
Signs You’ve Stayed Too Long
Your body gives clear warnings before heat exposure becomes dangerous. Leave the sauna immediately if you notice any of the following:
- Dizziness or lightheadedness
- Nausea
- A rapid or pounding heartbeat that feels uncomfortable rather than just elevated
- Confusion or feeling “off”
- Muscle cramps
These are signs of heat exhaustion. If you experience them, step out, sit down somewhere cool, and drink water slowly. Most people never hit this point if they follow the time guidelines above, but pushing through discomfort in a sauna carries real risk. Unlike a tough workout, where “no pain, no gain” has some limited truth, there is no benefit to suffering through excessive heat.
How Often to Use a Sauna
Most studies that found health associations used frequencies of two to four sessions per week. The Finnish sauna trial that tested effects on people with heart disease used four sessions per week at 20 to 30 minutes each. That’s a reasonable upper range for most people.
Daily use is common in Finland and Scandinavian countries and appears safe for healthy adults who are acclimated to the heat. If you’re just starting out, two to three sessions per week gives your body time to adapt. There’s no evidence that more frequent sessions produce dramatically better outcomes, so pick a frequency you’ll actually stick with.
Quick Reference by Sauna Type
- Traditional dry sauna (150 to 195°F): 15 to 20 minutes for experienced users, 5 to 10 for beginners
- Infrared sauna (120 to 150°F): 30 to 45 minutes for experienced users, 10 to 15 for beginners
- Steam room (110 to 120°F, high humidity): 15 to 20 minutes maximum