It truly depends on the restaurant and the time of the year (how busy park is). With ADR you receive the first available table that will fit your party size. We were just there a couple weeks ago and it was the longest I ever had to wait for a table with reservations. It was at Crystal Palace in the MK for lunch and we checked in 10 minutes prior to our ADR time and we were not seated until 40 minutes after our ADR time! I do have to say though...this was not a normal experience for us. A lot of times we get seated as soon as we arrive and I think before this last time, the longest we ever waited was probably 15 minutes.