I retire at $5, maybe even a bit less. My actual retirement is in 2.5 years, I figured it would hit that by then, LOL
There isn't a number this could hit to make me retire, I'm too young.
But if it were to get to a sustainable $5, I'm seriously looking at a new lower salary, lifestyle enabling position. And if it got to $10 I'm probably quitting and picking up more fulfilling jobs like coaching or umpiring.