I ask parents what time they need the daycare, so I know when the child is coming, and when he/she is leaving. This gives me an advantage, especially if I can have a school-ager come before and/or after school. My parents are great as they let me know if they're going to be early/late for drop off/pick up.
For example: My hours are 7:30-5 - child A comes from 9-5, child B comes from 8-4:30, child C (school-ager) comes from 7:30-8:30 a.m.