We've done CP at 10:30. There are two sides to the buffet. First, it was breakfast on both sides. As we got close to the end of the meal, they changed one side to lunch items. I think we could have eaten from that side then if we wanted, but we were full and getting ready to leave.
I was impressed that the whole buffet had freshly put out items the whole time, and the food was abundant, even at the end of breakfast.
Around here, there are some restaurants where you are pretty much left with old scraps on the buffet near the end. So I was concerned about our 10:30 time before we went. But it turned out fine. We love CP!