If you need more than 7 nights, you start by booking the first 7 nights at the 7 month window. On the next day you modify the reservation to 8 nights by adding the next night night (7 months and 7 days from "day 2" of you stay, while keeping "day 1"). You then continue adding 1 night each day until you get the length of reservation you need (pending availability of course). I believe the maximum reservation length at any time is 30 days.