It's probably time to move the bait. You might want to try more than one location at a time if you can. Even though Texas is overrun with feral hogs, there are times when I put out corn and don't see any hogs on my game camera for months. They tend to roam and change their territory seemingly at a whim, although they're most likely responding to changing food conditions and hunting pressure.
It can be tough to predict exactly when and where they'll show up on any given day, at least around here.