I usually start kids off full time all day...they transition faster that way. However, if parents want a slower transition I have done half days before. An hour spent there is nothing. All it is, in my opinion, is disrupting the day. Does very little to help the transition. The biggest thing is making sure he is on a consistent schedule at home, is napping and eating at the same time he would at your house. I like kids to be at 1 nap but if not I do the transition slowly over a few weeks at my house. Make sure he is comfortable eating finger foods, drinking from a sippy and self soothing. All those things make transition much easier. Good luck!