No, you would be cooked, but I had a hunch that obviously people already tried to see how long you could stay inside and yes there was a competition in Finland exactly for this: https://en.wikipedia.org/wiki/World_Sauna_Championships#2010...

I said "was" because 2010 was, in fact, the last edition of the event:

> On 7 August 2010, two competitors were removed from the sauna and brought to the hospital in critical condition after six minutes of 110 °C (230 °F) heat