I don’t know exactly how the waitlist works. Perhaps it is a cast member doing it, or perhaps it is a computer program that runs continuously or intermittently. My money is on a computer program. Anyway, I have seen it work almost instantly. One morning, when trying to book at 8 AM Eastern time, the day I wanted, exactly at 11 months, wasn't available. Gone within 5 seconds, and I wasn’t fast enough. But the same thing had happened the day before, and I had created a waitlist for that day. Well, several people who were ‘walking’ reservations apparently suddenly freed up the day before, which I had placed on the waitlist the previous morning. So I went in to cancel the waitlist and grab the room, and it had already been filled, almost within seconds of it becoming available.