Vacation Points Overview - Frequently Asked Questions
The Rule of Four guideline is that you cannot book and travel on the Disney Collection (excluding hotels at Disneyland Resort in California and Tokyo Disney Resort) and Concierge Collection vacations within the last 4 months of your Use Year.
However, you can travel in the last 4 months of your Use Year as long as you've booked your stay more than 4 months before the end of your Use Year.