Hmm...I just bought the regular 1 day (the 20% off single day option that JenDaveBrendan posted directions for).
The quote I posted is on my eticket, under "Legal Terms."
Regardless, when I called to ask about the 7 day promotion, before I bought my tickets, I was told that It works just like that two days for one promotion that they had been running and that anyone with a one day ticket can get the 7 day promotion. The promotion dates are supposed to be January 1 to December 31, 2006.
So, it really doesn't matter if your ticket says it or not, anyway.
My ticket doesn't have an expiration date, either. I did have to assign names to each of my etickets though, and they are non -transferable.
Also, I was able to print extra copies of the tickets, so I don't worry so much about missplacing them. And I believe you can log-in and re-print if you need to. Both are nice features.
If you want to check for sure, on expiration, or anything else you, you can call Seaworld at 1-800-327-2424. They are very helpful.