I dont remember exacy hours but know mine was 3 weeks. They basicly teach you how to pre trip and pass the test. Yard Work and Some driving on interstate I-75 in ATL. Then you get a job and learn some from the trainer. Then you go on your own and thats where you make it or wash out.
Georgia Driving Academy in Columbus has a great 180 hour program, I just finished last week. They have decent facilities, excellent instructors, simulators and nice office staff. A lot of recruiters will come and speak with you.