I did it once, once and NEVER again! I open at 730 am , I agreed to help a neighbour, and take their baby at 630am, and they were supposed to be gone by 930 am (parent was a school bus driver) one morning he shows up at 615, because he wanted to grab some Mcdonalds on his way to work.....I terminated.
It really sucks, but in this business you cant do favours, you will be taken advantage of in a heartbeat.