Post by mainelyfoolish on Feb 17, 2019 18:29:26 GMT -5
If you have three contiguous room-only reservations, you should be able to book all of your fast passes as soon as the window opens for the first reservation. If you booked one of those hotel stays as a package with tickets, then the booking window won't open up until 60 days before the reservation that has the attached tickets.
For the ILs, I'm not 100% sure but I believe you will be able to book their fast passes on the first day of your first reservation's booking window as long as they don't have their tickets as a package with their hotel reservation. If their tickets are part of a package, you'll have to wait until 60 days before their hotel reservation for their tickets to be available to book fast passes.
ETA: I assumed you're talking about on-site Disney hotel reservations.