I can't remember but I thought their was an expiration date for activation. You might want to check but November just might be too long. In the end, the house is obviously your priority.
+1 to that
Just checked my paper work. It said to activate by Dec 14. I had the upgrade offer in the mail also. I always keep my paper work in a file.
I recieved mine about August 13 so they must give 4 months to activate. YMMV