In preparations for our next trip, we attempted to make dining reservations at some hard to get locations without success. We tried at 60 days, plus the 5 days of the trip, and was unable to get a few restaurants we wanted to experience. Is there a specific time when checking for cancellations that offers the best chance of success? I understand closer to the day availability increases, but are there any approaches that work up to that point? Checking in the morning, or late at night, reservations released later, or is it near-real-time, and you just have to get lucky and get a reservation when one is cancelled?