Most people should stay in an infrared sauna for 15 to 30 minutes per session. Beginners do best starting at 10 to 15 minutes, while experienced users can comfortably extend sessions to 30 or 40 minutes. The right duration for you depends on your heat tolerance, the temperature you set, and how often you’ve used a sauna before.
Infrared saunas operate at lower temperatures than traditional saunas, typically between 45°C and 70°C (110°F to 160°F), which makes them feel less intense. But that gentler heat can be deceptive. Because infrared light heats your body directly rather than just warming the air around you, the thermal stress builds steadily, and staying too long carries real risks.
Beginner Sessions: Start Short
If you’ve never used an infrared sauna, aim for 10 to 15 minutes at a lower temperature, around 45 to 50°C (110 to 120°F). This gives your body time to adapt to the heat without overwhelming your cardiovascular system. Your heart rate rises in a sauna much like it does during moderate exercise, and jumping straight into long, hot sessions is the equivalent of sprinting without a warmup.
After your first few sessions, increase your time gradually. Adding 2 to 5 minutes per session over the course of a week or two is a reasonable pace. Once you’re comfortable at a lower temperature for 20 minutes or so, you can begin nudging the heat up in small increments. Adjust time before temperature, not both at once.
Experienced Users: 30 to 40 Minutes
People who use infrared saunas regularly can tolerate sessions of 30 to 40 minutes at higher temperatures, in the range of 60 to 70°C (140 to 160°F). Going beyond 45 minutes offers diminishing returns and increases the chance of dehydration or heat-related symptoms. Even seasoned users should treat 45 minutes as a hard ceiling.
The clinical research on infrared saunas overwhelmingly uses 15-minute sessions. A review published in Canadian Family Physician examined multiple studies on heart health, chronic pain, and fatigue, and nearly all of them used daily 15-minute sessions over two to four weeks. Participants in these studies saw measurable improvements in blood vessel function, pain levels, and exercise tolerance. That’s worth noting: you don’t need marathon sessions to get benefits. Consistency matters more than duration.
How Temperature Changes the Equation
Time and temperature work together. A 40-minute session at 45°C places less total heat stress on your body than a 20-minute session at 70°C. If you prefer higher temperatures, keep your sessions shorter. If you like longer sessions, dial the heat down.
A practical starting framework: set the sauna to your target temperature, step in while it’s still warming up (around 37 to 40°C), and let your body heat gradually alongside the cabin. This avoids the shock of walking into a fully preheated space and gives you a few extra minutes to acclimate before the real thermal load kicks in.
How Often Per Week
For general wellness, 3 to 4 sessions per week is the most commonly recommended frequency. Beginners should start with 2 to 3 sessions per week to see how their body responds between uses. More experienced users aiming for specific goals like athletic recovery or stress management can go 4 to 5 times per week.
A reasonable weekly schedule for someone who’s been using a sauna for a few months might look like 3 to 5 sessions of 20 to 30 minutes each. Rest days between sessions aren’t strictly necessary, but paying attention to how you feel the day after is important, especially early on.
Children and Older Adults
Children and older adults are more sensitive to heat and need shorter sessions at lower temperatures. For children, one recommended approach starts with just 10 minutes at the lowest setting with the door open, then adds 2 minutes per session on alternating days while slowly increasing the temperature by a couple of degrees on the off days. The target ceiling is typically 30 minutes at around 55°C (130°F), reached over several weeks.
Older adults should follow a similar cautious approach. Age reduces the body’s ability to regulate temperature and detect overheating. Starting at 10 minutes and progressing slowly, with close attention to how you feel both during and in the 24 hours after each session, is the safest path.
Warning Signs to End Your Session
Your body gives clear signals when it’s had enough. Dizziness, nausea, headache, unusual weakness, and confusion all mean you should get out immediately. These are early signs of heat exhaustion, which can progress to heatstroke if ignored. Heatstroke sometimes develops gradually with vague symptoms like restlessness or feeling “off” before it becomes dangerous, so don’t wait for dramatic warning signs.
Feeling warm and sweaty is normal. Feeling lightheaded, foggy, or nauseous is not. If you experience any of those symptoms, step out, sit somewhere cool, and drink water. If symptoms persist for more than 15 to 20 minutes after leaving the sauna, seek medical attention.
Hydration Before and After
Dehydration is the most common problem with regular sauna use, and it’s entirely preventable. In the 1 to 2 hours before your session, drink 16 to 20 ounces of water slowly. During sessions longer than 20 minutes, sip 4 to 8 ounces of water inside the sauna.
After your session is where hydration matters most. Within 30 minutes of finishing, aim for 16 to 24 ounces of water, ideally with some electrolytes. A pinch of sea salt in your water works if you don’t have electrolyte tablets. Over the next 1 to 2 hours, continue sipping fluids. A good rule of thumb: replenish about 50% of your estimated sweat loss in ounces of water. For a typical 30-minute session, that means roughly 48 ounces total spread across the 3 hours surrounding your sauna time.
Plain water alone isn’t ideal for heavy sweaters. You lose sodium, potassium, and magnesium in sweat, and replacing only the water without the minerals can leave you feeling drained even if you drink plenty.