Yep.
My brother lives up pretty high in CO. He can sit through 18-20 damn near all day.
The only times I’ve personally had to do that, were with a college football team coaching staff (No. I won’t say who.), and a couple of young pop bands (imagine that.).
On all occasions. There was quite a bit of alcohol (and who knows what else) involved as well.
Normally. A quick climb to 15 will certainly calm anyone down if they’re being really rowdy. Add “drunk” into the formula, and they’re out. Then we’ll drop them back to 8 or so.
If you’re in good shape, and just sitting there, 15 really wont do a thing to you. A bit depends on the climb rate though.
But if I want you to sleep… You’re going to sleep.