I'd just like to add that the CMs at the turnstyles can NOT check a ticket without putting it through the turnstyle as if to enter. We cannot tell you how many days are left on a pass. (After the ticket has been read by the turnstyle, we can check and see where the pass was last used, but that doesn't tell us how many days are left)
Also, if you put a ticket through, you will use it for that day. I've seen some folks come up with 2 sets of passes, and they couldn't remember which one they used earlier that day (wanted to make sure they kept using the same ticket all day, so as to NOT use a day from their "new" pass). If you're in that situation, go to guest relations before you hit the turnstyles.