Yes it will. The temperatures in most saunas are above the limits for the device set by Apple, and the high temperature will allow water vapor into the device that will condense when you leave and could damage your display or the electronics.
In a Swedish sauna yes, in a Finnish sauna no.
A dry sauna does not need a exhaust fan
Wet sauna is more beneficial with people with psoriasis
No, since sauna is very humid and it makes your body sweat more.
Read the assembly manual.
Steamroom is Turkish invention and a lot colder, Sauna is Finnish invention and a lot hotter place.
A sauna is warmer than body temperature. Inside a sauna your body has difficulty cooling off by perspiration. If your internal temperature gets too high, it can cause brain damage. That is why saunas have time limit recommendations. The owners do not you brain damaged in their saunas. Of course you are probably already brain damaged if you refuse to follow their regulations.
Prolonged exposure to infrared sauna heat can lead to dry eyes, irritation, and potential damage to the cornea. It is important to use protective eyewear and limit sauna sessions to prevent eye problems.
Depends on the temperature of the sauna and on the individual. Anything between a few minutes and several hour.
It is not recommended to bring magazines into a sauna as the high temperature and humidity can damage the paper and ink on the pages. It's better to focus on relaxation and letting your body enjoy the heat in a sauna.
The word "sauna" comes from the Finnish language. It is a traditional Finnish practice of using a room or building to experience dry or wet heat sessions for relaxation and health benefits.
Sauna suits are not meant to be worn in sauna. You are supposed to be naked in there.