I require the parents to fill in their hours on the contract that they sign. If it's erratic, I have them understand that I provide a maximum of 9 hours of care per day per family for their XX amount of dollars per week. Anything before and after that have to fit into my daycare hours (7-5) AND carry an additional charge. I absolutely refuse to work more than ten hours a day. I am already exhausted by dinner time, and it's not fair to my own kids.

Yeah, and michellesmunchkins, to the mom who had the balls to tell you when to schedule your extra curriculars, I'd send an email or give her a typed letter stating that from now on, AS PER YOUR SIGNED CONTRACT, you expect her to pick up and drop off during the agreed upon hours.