What's the deal with America's Got Talent?

Seriously, how long is the audition/callback process? It's been months now since the show started, right? And they just finished the callbacks?

I lost interest a long time ago. (The stupid audience screaming didn't help much.) And my lose of interest has nothing to do with the talent. From what I've seen, there are a lot of people who are amazing at what they do. (Those young kids, while heartwarming enough, don't do anything for me - I really hope they're gone soon. Harsh, probably.)

So does NBC just have nothing else to put on the air that they have to elongate the process? And now we have a couple weeks of the Olympics... Will AGT ever finish up?