ATP doesn't guarentee any type of airline interview as a selling point, though they do try very hard to get their instructors hired...
Ehm, Check the airline minimums? From 0 to regional right seat? Probably 1200-1500 hours, which is a good 2 years of flying. ATP instructors get a lot of hours though, and most if not all are multiengine PIC (dual given), so you have an advantage there.