Something happened tonight and I thought of this thread. While waiting for my FP window by SM, a group tried to use FPs that were about 90 minutes expired. The CM pulled out a list, and said that the ride reopened before their window closed, so they couldn't honor the FP. They argued that they are turned away at the start of the window, but she said they had a whole hour. A lead was called, and I was sure they would be let in, but he said no too. When our window opened the line was backed up to the ramp, and they were honoring some FP, but they were checking each against the list. And then the ride cascaded again while we were there. So I'm sure there were more people going to be turned away later tonight because it reopened within an hour.