My CP ADR is for 8:50 (Hoping to get one a little earlier ) in November with a park open of 9:00. How early will they let us into the park for a 8:50 ADR?
I believe you'll be allowed in at least a half hour before your reservation, if not earlier. Not sure if their is an 'official' amount of time before your ressie that they let you in because others before you will be eating as early as 8:00 if not earlier.
I did this once and loved the opportunity of taking pics of my niece with a nearly empty Main Street and in front of the castle.