Haven't missed a deadline in more than a year, which is more than I can say for most of my coworkers. It turns out that work with a fresh morning brain for 4 hours, a long break, and then later on more work with a refreshed brain is much more efficient than sitting for 8 hrs in an office for no reason.

If I choose to refresh myself via mid-day beer, so what? The code doesn't care how long I sit inside an office. It cares how well my brain works.

(..yes, too much beer and it won't work anymore. Everything in moderation.)