I have a December UY but I want to book a May vacation with the 7 month window. I have some banked points from 2009, but I'll have to use some from 2010, so those will have to be borrowed if I book in October (7 months), right? The problem is that I'm not 100% sure how long we want to stay, so what will happen if I cancel a few nights after borrowing those points? Can those 2010- borrowed points be banked after being borrowed if I don't use them all? Thanks!