To expand on that... general availability is less on 60, 60+1 etc than later in your trip. You would start there trying to get reservations IF you didn't have any hard to get ADRs on your list. If you are trying to get really popular ones (Smugpugmug mentioned a few... Space 220 and Sci-Fi Dine In are also tough to get), you have a better chance of getting them if you plan for them to be at the end of your trip AND try to reserve them first when your 60+10 window opens. Once you try for those hard ones, go to trying to get the earlier-in-your trip ADRs and go forward from there.