Disney does say nothing before 12:30 pm. Others have made earlier. We barely made 12:35 (all due to security delays at the airport), so if I were to do that trip again I would probably be more comfortable with nothing before 1 pm myself.I am pretty sure DCL says 12:30, many Diser's will go as early as 11:00. Just depends on how much stress you want that morning....
Personally, I wouldn't book before 12:30. We have twice experienced lengthy delays disembarking when passport control or customs did not clear the ship.What is the earliest I shoud book my return flight on the day we get off the boat?