My drop off is between 7:30-9. This is for all the reasons mentioned. This way you can ensure they aren't sleeping in and throwing off the schedule and I also tell the parents that it isn't fair to their child if they arrive at 11 and then they have to eat lunch and nap without getting a chance to play with their friends. That usually helps them understand why it's important. I think they care less about how it impacts us as they (some parents) think we just need to deal with it as it's our job.