Is the time frame changing ?- from the member website about booking the Disney Collection:
Reminder: 60-Day Rule
You cannot book and travel on The Disney Collection, (excluding
Disneyland© Resort Hotels in California), Concierge Collection and Adventurer Collection vacations within the last 60 days of your Use Year. However, you can travel in the last 60 days of your Use Year as long as you've booked your stay more than 60 days before the end of your Use Year