>I don't think anyone is capable to sit in a 90-100C sauna for a whole hour without breaks, otherwise with breaks I surely have been in a sauna for more than an hour.

Yes, I definitely do agree with that. I too love what you're describing - we have some of that in Poland too :)

However, I was not sure if we're talking about it - or some American version I know only from various memes - where people are coming in with phones and in shoes.