 I've seen Joe Rogan, he'll do it for like 20 minutes at like 33 or 31 degrees or something. That video that you're describing, if Rogan knew what he knew now, I don't think he would do that again, because you can get hypothermia, you can die from excessive cold. It is a diminishing return, you want to get your dose, what doesn't kill you makes you stronger unless it kills you.