I might be misunderstanding the question. However, since I take paid vacation time, as long as parents give me 4 or more weeks notice, they get their full deposit back (which goes towards their last month of fees). It doesn't matter if I'm on vacation at some point during those 4 weeks or not. They are unable to provide notice while I'm on vacation. They'll have known for months that I was taking vacation, so will have to wait until my return and either still give me 4 weeks notice or forfeit their deposit.