When I was a kid at my Grandparents (Finns), a sauna was an hour long over 200 F. 15 minutes in 5 minutes out (or however long it took the adults to drink a beer) times 3.
Females went first and refired the stove before the males went.
The Finns have this down to a science, and preach this as a health mandated thing. It’s hard to find any other European culture who goes to this extent. But it’s also a social meeting thing, which Finns tend to have issues in having conversations with people (especially strangers).
During THE WINTER WAR between the USSR and Finland, the Finns had saunas behind the front lines on the Karelian isthmus.