I wonder about that myself. I know my limits and can't stay in a sauna for too long, but I've heard that folks in Finland take it really far. But... reading up on the World Sauna Championships, it seems that even the most heat-adapted Finns tapped out after 16 minutes or so. That was in a ludicrous 110C with a steep humidity ramp, and they stopped running the competition after a contestant died and another one nearly died after about 6 minutes.

I've tried to look for better statistics about how much folks in Finland can actually tolerate, but all I found was this spectacular batshit: https://www.reddit.com/r/finlandConspiracy/comments/op97qm/t...