The extra weeks must be standard. I ordered my DDE last March. I received it in a week's time, and the expiration date is 04/30/05.
I think they just allow extra time to cover for processing and mailing.
The DDE card begins, apparently, with the e-mail they now send.
Your AP begins upon activation (at a Park).
The DDE card seems to be approx 13 months, rather than 12. (The following year and month after payment.)
The AP is good for a year to the exact date it is activated.