This depends on when your ADR is booked for. If it is earlier (before 8 am) or later (after 9.30 am), then you may get seated within 10 - 20 minutes of arrival.
Breakfast and character meets took about 30 - 45 minutes (but we are fast eaters). We hung around about 10 minutes longer than we should as we were waiting on Dale. A CM noticed and got Dale out ASAP for us, which was great.