Pre-Rd ADR

How early will you be admitted to MK for a pre-rd ADR? Do you have to be within a certain time before your reservation? We have an 8:30 time for a 9:00 park opening but I was curious how early we could get through the gates. Thanks!

In July they let us in minutes to 8 for an 8am adr. You should will be able to get in around then, but probably no earlier than 7:45.