Just to add to Chuck S, the number of credits is based on your reserved nights of stay per reservation. I've booked a split stay, which complicates my use of the DDP (but we're going to try it!). The credits from the first reservation have to be used (or lost) by midnight after checking out of the first resort, even though the credits from the second reservation start as soon as we check into the second resort. It just means we have to stay on top of our remaining credits and keep up with the old and new room keys, as the DDP credits are attached to the keys (and we have separate park hoppers-sheesh! that's a lot of plastic to keep up with).