Most healthy adults should aim for 15 to 20 minutes per sauna session. Beginners should start with 5 to 10 minutes and work up from there, and nobody should exceed 30 minutes in a single sitting. Beyond that simple answer, the ideal duration depends on your goals, the type of sauna you’re using, and how often you go.
The General Time Range
A session of 15 to 20 minutes, three to seven times per week, is the sweet spot most often cited by doctors for overall health benefits. If you’re new to saunas, spending even 10 minutes in 175°F heat can feel intense. Start at 5 to 10 minutes for your first few visits and add a couple of minutes each time as your body adapts. The upper safety limit is 20 to 30 minutes, mainly because the longer you stay, the more fluid you lose through sweat.
Why Longer Sessions Show Greater Heart Benefits
A landmark Finnish study tracked over 2,300 middle-aged men for 20 years and found a clear pattern: the longer each sauna session lasted, the lower the risk of fatal heart events. Men who stayed in the sauna for more than 19 minutes per session had a 52% lower risk of sudden cardiac death and a 36% lower risk of fatal coronary heart disease compared to those who stayed for less than 11 minutes. Fatal cardiovascular disease of all types dropped by 24% in the longer-session group.
That doesn’t mean you should force yourself to stay longer than is comfortable. The men in this study averaged about 14 minutes per visit in a traditional Finnish sauna at roughly 175°F. The benefits built gradually with both duration and frequency. Over the 20-year follow-up, 49% of men who went once a week died from any cause, compared with 38% of those who went two to three times a week and just 31% of those who went four to seven times a week.
Traditional Dry Sauna vs. Infrared Sauna
The type of sauna changes the math. A traditional Finnish dry sauna runs between 160°F and 200°F (70 to 100°C) with low humidity, and 15 minutes is a standard session length. Infrared saunas operate much cooler, typically 120°F to 140°F, which means you can comfortably stay in longer. The average infrared session runs about 20 minutes, with experienced users going up to 30. If you’re trying infrared for the first time, 10 to 15 minutes is a reasonable starting point.
Because infrared saunas heat your body more gradually, you’ll still sweat heavily but without the immediate blast of heat that makes traditional saunas feel overwhelming. The lower temperature doesn’t mean less benefit; it just means the timeline shifts slightly longer.
A Protocol for Growth Hormone Release
If your goal is to trigger a large spike in growth hormone (which supports muscle repair, fat metabolism, and recovery), the protocol looks very different from a standard session. Research shows that infrequent but prolonged sauna exposure, once a week or less, can increase growth hormone release by up to 16-fold.
The protocol that’s been shown to work: 30 minutes in the sauna at 176 to 212°F, followed by 5 minutes of cooling off outside the sauna, then another 30 minutes back inside. Later the same day, you repeat that cycle for a total of four 30-minute sessions. This is an advanced approach and not something to attempt as a beginner. It also works best in a semi-fasted state, meaning you haven’t eaten for two to three hours before starting.
For everyday recovery after exercise, a single 15 to 20 minute session is more practical and still promotes blood flow to sore muscles.
Hydration Before, During, and After
You can lose a surprising amount of fluid during a sauna session, which is why dehydration is the primary risk of staying too long. A practical hydration plan: drink about one glass of water (200 to 300 ml) before you step in, sip small amounts if you’re doing a longer session, and drink at least half a liter to a full liter of water afterward. If you feel lightheaded, nauseated, or your heart is racing, step out immediately. Those are signs your body has had enough regardless of how many minutes have passed.
Cooling Down Between Sessions
If you’re doing multiple rounds (a common practice in Finnish sauna culture), give your body at least 10 minutes to cool down between sessions. Your core temperature doesn’t drop instantly when you leave the sauna. It takes a full 10 minutes or more for your body to regulate itself back toward its normal range. Some people use a cold shower or cold plunge to speed this process, but simply sitting in a cool room works fine. The cool-down period is also when your body works hardest to restore its baseline temperature, which is part of what drives the cardiovascular conditioning effect of regular sauna use.
Putting It All Together
For most people, the practical routine is straightforward: 15 to 20 minutes in the sauna, three or more times per week, with water before and after. That lines up with both the safety guidelines and the research on heart health benefits. If you’re a beginner, start at 5 to 10 minutes and build up over a few weeks. If you use an infrared sauna, you can extend sessions to 20 to 30 minutes at the lower temperatures. And if you’re chasing a specific performance goal like growth hormone release, the protocols exist but require significantly more time and should be approached gradually.
The single most important rule is simpler than any protocol: leave when your body tells you to. No timer should override how you actually feel.