I think
@sponger76 is on the money here. Here are some calculations I computed from Marriott Vacations Worldwide's 2022 Form 10-K Annual Report.
MVW reported $509 million in rental revenue for 2022.
They also reported that they had 122 resorts with 31,692 keys (meaning rooms/units)
We would have to make some assumptions as to what the average rental rate was in 2022 to arrive at how many rental nights that $509 million represents. I know Hawaii MVC/Westin/Hyatt units tend to rent for upwards of $700-$1200 per night on marriott.com as do many other beachfront properties. Other markets are less, in the $350-$600/night range depending on season. Just to pick a number, let's say the average rental rate per night was $650. That would mean the $509 million represents about 783,000 room nights. If we use $500/night as a lower estimate instead, then that represents 1,018,000 room nights.
So, using the 31,692 keys/units, the 783,000 nights would represent an average of 24 nights per unit and the 1,018,000 nights would be 32 nights per unit. So that means rental nights are likely less than 10% of total nights available in a year.
I will also note that these numbers do not include the four hotels owned and operated by MVW (Sheraton Kauai hotel portion, Westin Resort and Spa Cancun, Hyatt Highlands Inn, and the Branson Hillside Hotel). Those surely contribute additional room nights not included in these numbers, but they are small, so probably don't impact the numbers above much.