It's not always the job. Sometimes it's the person. Had a junior developer I literally had to shoo away from his desk at the end of the day, otherwise he'd keep working until 9 PM.

I tried to tell him: Nobody asked this of him. He didn't need to prove himself, it wasn't on his back if we didn't meet the deadline, it wasn't worth sacrificing his health and the relationship with his wife and more than likely burning out before 30.