I've got a toupe on the bike I ride lots of long rides with. For me that's up to seven hours of saddle time so I think it's right for my butt, YMMV.
One thing I can say for sure is that when I ride in the basement, I get some discomfort in less than an hour.

I'm pretty sure I don't adjust my position nearly as often on the rollers as I do on the road, but it could just be boredom too.