My families are pretty consistent. I have 1 that has pickup or drop off times that vary. It used to bother me but now I don't care. This morning he came after we did our morning craft - oh well too bad. Once it is done its done. My policy states that if I leave my home I provide 24 hours notice and need car seats supplied so parents know when we are going on an outing. As for pickup all are pretty consistent but sometimes a few vary on occasion. For the most part if the pickup or drop off is going to be completely different the parents will text or tell me at drop off. I don't worry too much about it, we just carry on with our day and if they are here they are here, if not too bad you missed out.