[RHSeeger]

As I understand it, it's diminishing returns for a while past 40. Putting in more than 40 hours does get more done, just not as much per hour as the earlier hours.

[lugg]

At a point the negative impact takes a toll on your productivity all week long.

We aren't robots. Having a late night today effects my work tomorrow.

[mattmanser]

Nope, that's wrong. You get falling OVERALL productivity.