I issued three GCs back on 4/5/06 to a friend to give away as a prize. She finally gave one of these out over the weekend, but when the customer went to the checkout, it wouldn't take the code. I did some checking, and all three of the codes were showing that they were redeemed on 5/5/06. I checked my orders for that day, and none of them had been used. That all leads me to believe that GCs expire after a month. Anyone know for sure?