I've currently got a PS for Prime Time at 6:00 - that's the latest they had left. The parade is at 5:30 - we'll sit as close as possible to the restaurant, but I'm not certain if we're going to make it the 5 minutes before that they request. I know in the past, we were going to be running late for Rainforest Cafe at DTD, and I called to try to move it back. They couldn't, but the CM told me that you were allowed 15 minutes from the time of the PS. I wasn't sure if this was just at Rainforest, or if this was a policy for all of the Disney restaurants.