My understanding is that Starwood is restricted from selling as "fixed weeks" more than 50% of each class of its BV inventory for any given week. Thus, even for weeks 51, 52 and week 7 (the customary "holiday" weeks) 50% of the BV inventory must be available each year to owners who own floating weeks in their particular season of ownership. There are other weeks during the platinum plus season that will have significant fixed inventory such as spring break weeks (11 and 12) and week 15 which often is Easter week. Other weeks likely have a lower percentage of fixed ownership. In any case, as noted, I believe that at least 50% of the BV inventory for each week is required to be available for reservations by BV floating week owners.