Where I board, we have all day turnout. If the weather is really nice, this can mean 16hrs of turnout, so stalls are basically untouched. If the stalls are pretty much untouched and scheduled to be stripped the next day, my BO will skip cleaning them.
On yucky days when everyone is stuck inside for all or most of the day, my BO cleans the stalls at least 3x per day. She also cleans all the stalls right before the Vet/Farrier arrive since she keeps everyone inside for those visits so nobody is anxious about a buddy not being around.
I'm fine with this, I know if I personally was cleaning stalls, I'd do the same thing!