Everyone I’ve been calling at Disney (I know, I know, the jokes about asking CMs, almost as bad as asking bus drivers) says 45 minutes before park opens and so you will have to get yourself there in time for an 8:15 adr, at least until the extra half hour starts. Had to cancel my adr because I don’t want to risk it (we would need a car seat and, while some Uber have car seats, I can’t guarantee I’d get one). Disappointing because I think CRT has great breakfast.