If your kids love video games, they will love Disney Quest. My 13-year-old son, who is addicted to video games, thought he had died and gone to heaven at Disney Quest. He could have gone to Disney Quest everyday of our seven day trip and stayed for eight hours a day.
My 11-year-old daughter likes video games, but not as much as her brother. She thought Disney Quest was fun, but three hours would be plenty of time for her.
If you decide to go, check out the discount ticket sites like ticketmania.com.