Start with about 10 minutes and work up to as long as 40 minutes or so each session for optimal health benefits according to your goals.  As you get used to using an infrared sauna, you will need to get used to how long it takes to break a sweat, and time yourself after that point between 20-45 minutes or so. If you don’t normally sweat a lot, it may take a few sessions before you begin to sweat much during a session. The temperature of the air in the sauna does not need to be uncomfortably warm for you to start sweating, so you may not feel the urge to leave due to discomfort from heat. As always, stay well hydrated before and during each session, and leave the sauna if you feel unwell, dizzy, or overheated. Always consult your doctor before starting to use a sauna.