Triton's/Lumiere's serves a sit down breakfast and lunch or brunch each day. Parrot Cay serves the character breakfasts on 7 night cruises.
For lunch, Parrot Cay generally has a themed buffet (Italian, Oriental, etc).
Topsiders will have breakfast and lunch buffets daily and the fast food outlets on deck 9 will be open.
The only one that has a seating time is the character breakfast. Otherwise, you go to any food outlet during the hours they are open (in the Navigator). The sit down menu for Tritons/Lumiere's will be posted outside the restaurant as soon as the preceding meal ends so you can check it out before you decide where to eat.