I will be booking a smaller DVC at Christmas at 11 mth mark and need 2 units. If I reserve 2 DVC units at 11 mths for a 5 day trip, can I call back within 4 days to add on extra days for those units--meaning it is still more than 11 mths out for anyone else to book those particular units? Since 11 mths is also the earliest to book airlines, we might need to move a day or so around to coordinate flights--I don't want to book the whole 7 days, b/c I would have to borrow points and we might only need 5 days, depending on flights. Thanks, Elaine