Unless you are booking a hard to get reservation, why not just wait 5 days past the exact 11month window? Then you can call and book all 12 days in the same call, at the same time, under a single reservation without modification.
I just reserved 10 nights in a 1 bedroom at OKW for mid-May with no problems at all. Unless you are looking for Spring Break, Thanksgiving, Christmas Week, Marathon, etc., you should be fine delaying the process a few days.
Nor do you need to call EVERY DAY to add on to an existing reservation. The room can not go back into bookable inventory until 11 months from the final day of your reservation. For instance, say a resort has 3 one bedroom units. Unit #1 is booked on November 1 for October 1 to October 7, unit #2 is booked on November 2 for October 2 to 8, and Unit #3 is booked on November 3 for October 3 to 10. No one could call before November 7 to book a new reservation for a one bedroom for October 7, but the person holding the October 1 to October 7 reservation could call on November 5 to extend the reservation. It would have to be available, unless the room is going out for scheduled maintenance.