Limit is up to 24 One Time Use Points, per year, per membership number. (I DO NOT believe it is PER CONTRACT, even though the site initially starts out by talking about your contract.)
One Time Use Points cannot be Transferred, Borrowed or Banked. They can only be used for reservations within the 0 to 7 month window, and they expire at the end of the Use Year where you bought them to originally use them. For instance, if you have a February Use Year, you are currently IN your February 2019 Use Year. You cannot use the OTUP in the 7 to 11 month Home Resort Priority Window. Which means that, as of right now, today, June 22, 2019, your CAN NOT purchase OTUP to use for any reservation after January 22, 2020, which is in the O to 7 month window. And, they will expire on January 31st, 2020.