Up to 35% can be sold as fixed weeks.
For example, for 100 studios, up to 35 can be sold as a fixed week.
Bottom line is, in any one given week, its possible only 65% of the rooms in a certain class may be available for booking with points (making it a little harder to book, and 11 months that much more important)
If you typically go the first week in Decemeber, week 49 might be a good fixed week for you. You pay a premium for that, but your ressie is guaranteed. The fixed week owner may cancel that ressie at which time the points would go into their account for normal usage.
PS. Welcome home neighbor