2 Minutes? Easy. In the winter me and my friends used to go to the public swimming pools which they had a sauna which I normally hurt because of how hot they are but because of the snow and ice formed there was a outside pool too which is normally frozen in the winter so we would break a hole in the ice and jump in the sauna for 2 minutes and then rush and jump in the outside frozen pool. who ever gets out first gets a whip to the back which is very painful due to the cold