The last time we went there I think we had a 12:45 PM ADR and arrived about 20 minutes late (Don't ask. It involved 2 newly minted teenage girls, hair styles and a bathroom mirror-eek!). The podium was closed and after about 10 additional minutes we found a CM to take us up to the restaurant floor where our reservation was honored.
The full appetizer buffet was still in place when we sat down at what must have been around 1:15 PM. At one point while eating the appetizers the waiter took our entree orders and encouraged us to order any seconds we might want. Later, in the middle of eating our entrees the waiter stopped by to let us know the dessert station would be closing soon so if we wanted anything he'd be happy to ask the kitchen staff to hold up a bit. I'd already noted that they were having a special Star Wars feature of some sort of weird looking chocolate doughnuts instead of the baba rhum so passed. The girls decided to try them but abandoned them on their plates shortly after; they looked like nothing I wanted to eat and I guess up close they decided the same. We took our normal box of pastries with us and the waiter added extras of certain types that we liked to the shopping bag. By the time we were leaving (after 3:00 PM) the dessert station was closed, and pretty sure the entree area was being cleaned up. There were 2-3 tables left.
That's the absolute latest we've ever been there and I felt neither rushed, deprived, or famished.
HTH!