You've "heard nothing" as in they haven't even cashed your check/run your credit card? That would be unusual, processing the payment is the first thing they do when they get your application, shouldn't take more than 1-1/2 weeks for that. If so they may not have even gotten your application.
If they have processed your payment...judging from posts on surplusrifle.com, the person that handles apps. from Texas seems to take the maximum time allowed. (they also say that sometimes calling and asking speeds it up)