There's a market for all kinds of schedules.....if that's what you want and you advertise accordingly, it may take time, but there will be demand for it. I think it sounds great. Long days for you, but broken up in a way that should be pretty good. Just because you do before/after school doesn't mean you have to offer service when they don't have school. If that's what you want and offer you will find the clientele that is looking for that. Like someone else said, a lot of kids do summer daycamps, anyways.
Good luck in you new adventures!