I think for me it would depend on the situation.
I've been to adult camping situations where a person could potentially be 'in scene' for days at a time.
A few years ago I attended a CFNM camp for 3 days where I (and all the other males) were naked and expected to be in 'sub' mode. Those 3 days were the longest I've been naked.
It wasn't 24 hrs of actively being tormented or worked over or spanked or something. There were times when I was just hanging out at the pool or sitting around chatting or something - BUT there was always the potential of a Domme just coming up to me and doing something, or ordering me to do slave shit like clean something, serve food or drinks, etc. It did happen. I could of course safeword and just walk away, but I didn't feel the need to.
I've considered days long scenes of being a puppy or pony - and just getting into that headspace and just staying there. It would be doable, but the reality of it is there would have to be stipulations like proper sleep, I'm completely miserable in the morning, especially right after I wake up, etc.
And drop is real and can hit HARD. One time I was driving home from pony camp back to the real world and I was just... A mess.