To clarify, I charge the same rate no matter how long they are here for (8-9.5h), but each client has contracted hours that they must stay within. My reasoning is that if my latest pick up client leaves, and I replace them with other parents with early hours (say I finish a 7:30-5 contract and get a 7-4) then I would have every child contracted to be picked up by 4, and I can plan my life around that. If I give them a set close time or max hours, I never know when I'm going to be working later, or entertaining just one child for an extra hour while they wonder why every parent came except theirs.