I believe the GF Pirate Cruise is from 10:00 to 12:00, and the Yacht Club/Beach Club Albatross Pirate Cruise is from 9:30 to 11:30.
We plan on having a nice, leisurely brunch, and strolling around the resort for a while.
They do give you a beeper, in case they need to contact you.
Other parents have rented boats, taken younger siblings to a character meal, or ridden the monorail to pass the time.