I think for a lot of things it doesn't matter, so either 10h or 32h are okay (eg. soaking beans, marinating meat). If it says overnight I assume the time doesn't really matter that much.
Yeah, I use pear to marinate thinly sliced beef (my variant of bulgogi). I wouldn't let that marinate overnight either. An hour or so is enough. Too much pear for too long and the meat becomes so soft it almost falls apart.
