8:30 is likely way too soon. It took us about 30 minutes after our 10am ADR to even be seated. You walk in, wait in line to meet Cinderella, then sit around and wait for your family name to be called. It seems like they seat everyone in a large group, then clear the place out and re-seat. It took us about an hour to eat and meet all of the princesses. With such an expensive meal, I wouldn't want to be rushed. I'd aim for 9:00 or a little later.