Here's something interesting for you, a guy I know, now retired from TWA after 30 years or so, was hired with 60 hours total time in nothing else but a 152. It was back in the Vietnam era, when military pilots were being held in the service and so the airlines were starving for pilots. They introduced "zero time" programs and took guys off the street, basically. On Friday, he said he was in a 152 when TWA called. Monday morning he was in the 707 sim for F/E groundschool. He moved up to F/O and the capt. on the 707, then the L-1011, and the last 8 years were the 747. He retired at 58 after getting a retirement offer he couldn't resist. Basically he was being paid almost as much to retire as he would have made flying for those last 24 months (about $450,000).
Things are a bit different now!
Nick