We actually wanted as late as possible for our PS for this coming August. My DSis got 10:00 and I got 10:20, (she cancelled already). We are going on an EMH morning, so we'll arrive @ 8:00ish have just over 2 hours of touring, then a nice, cool, relaxing breakfast/brunch in the castle. If all goes as planned, we'll then go on an FP ride that we had gotten passes for prior to breakfast and head back to the resort for a swim and a nap.
Funny story, DSis and I actually strategized about how exactly we could get "as late as possible" out of our months as fast as we could when we called without missing our opportunity. The "advise" states clearly that you must just blurt out "CRT. Party of 5." Oh, the stresses we endure in planning our Disney adventures!