Maybe you also accrue enough wisdom to know that after that 5-6 hours, however productive you might feel, what you write is going to be garbage so the smartest

Maybe you also accrue enough wisdom to know that after that 5-6 hours, however productive you might feel, what you write is going to be garbage so the smartest thing to do is stop, unless you want to waste even more time sorting out the mess later. I can still code for longer than this, from time to time, but only if I already know exactly where I'm going. Even then it's playing with fire.