My open and close hours are what is available for clients to choose from when they interview and place their child and I expect them to be consistent with what they choose because I plan my day accordingly. If they need outside their contracted hours and ask I would do it at no extra fee provided it was within my open/close window. Also if they put down my full 10 hours on their form but don't use it then after a few weeks the form is ammended - since I also have in my contract failure to arrive within 15 minutes of your contracted time with no notice may jeopardize care for the day - that goes back to when I did school runs or early park trips and we just left 15 minutes after expected arrival and I never told them what park I was going to as in no dropping kid off to me. Be on time or stay home. If you are running late let me know then we make arrangements.