“You promised your spouse that tonight was the night you’d be home by 6 p.m. After all, you haven’t even made it home for dinner since… come to think of it, you can’t remember the last time you were home before 10 p.m. or your dinner didn’t consist of processed vending machine fare.

But it’s not your fault, you tell yourself. If you don’t do it, who will? Putting in a little overtime is one thing, but how do you know when “enough” is too much? “