In general, it depends on the place where you live (maybe hot or cold). The temperature in the area around the sauna affects how long it takes to heat up. Give your outdoor sauna a bit more time to warm up if you reside in a northern region, have an outdoor sauna, and it’s the dead of winter. Additionally, the heat-up time will be influenced by how hot or burning a person prefers their sauna to be. The sauna will, however, generally reach 165°F in 30–40 minutes and 190°F in less than an hour, and cedar wood heats up more quickly than other types of wood.