We did online check-in through the My Disney Experience app a few weeks ahead of arriving and had an e-mail by 1pm with our room #.
3 p.m. but if you use the My Disney Experience app on your phone you can check in while you're driving there and if your room is ready it will go ahead and check you in and it will allow you a better pre-assigned room
Check in is 3 but if you get there early they might have a room ready for you if you ask.
3 p.m. and 11 last time I checked
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