Yes, it definitely fills up and they will turn families away once they reach capacity. A line begins forming before opening time. Plan to get there 15-20 minutes before the doors open if your child really wants to go. I can’t remember the exact times they were open (and it was never open for drop off on port days) but I want to say it was available for 2 morning hours, break for lunch, 2 afternoon hours, break, then evening hours. Search for recent Dailies that may show the times.