I mailed mine in on the 12th and received my card today, just over 2 weeks later. A lot quicker than the 4-6 weeks they talk about in the print on the rebates.
You shouldn't get too much trouble as long as you follow the directions. Just make sure to make a copy of everything you send, and IMO, get it sent via certified mail so you can prove the postmark on it.
That said, I hope you sent it in already. The rebate promotion had to be postmarked on 7/26, unless they extended the offer.