i'm pretty sure it is 11:00 a.m. i think breakfast hours are from 6:30 a.m. - 11:00 a.m. then lunch starts from 12:00 - 3:00 p.m. and dinner is 5:00 p.m. until i'm gonna say 10:00 p.m.
hope this helps. we love it when we go to wl and check in early then go and have breakfast or lunch. just the right thing to start a wonderful disney vacation.