You're on for 17 days a month so it's a bit more than 2 on/2 off. However in August and Sept Scheduling was done with me after 14-15 days and I was able to go home. Training pay is 300 a week and the company puts you up in MIA. You're on that till OE or you do an "observation ride." They sent me off a couple days after my checkride to observe and I got off training pay before OE.
Atlas was in the middle of contract negotiations and voluntarily extending was frowned on as it was thought the company wanted to raise the number of working days and would use stats of how many pilots "VXed" to show the pilot group overall was willing to work more than 17 days. It's gone to arbitration and I'm not sure what the feeling is now, the company could still point out folks are will to work more than 17 days. For me at the end of 17 days I'm ready to go home and clean out the mailbox.
Per diem runs about 800-900 a month and you can jump seat. IAH went sort of in the middle (above me in F/Os but that's not saying much.) HSV is junior.