The Startling Convexity of Expertise

Throughout my career I’ve noticed that when I work about 4-5 hours on something, I’m done. Regardless of whether I’ve allocated 6 or 8 or 10 hours to it, I either finish my tasks, or I run out of runway to finish them. Most of the time spent after that is just obsessive tweaking.

For many, however, it’s not just self-control issues that bias them toward the rhythmic philosophy, but also the reality that some jobs don’t allow you to disappear for days at a time when the need to go deep arises. (For a lot of bosses, the standard is that you’re free to focus as hard as you want… so long as the boss’s e-mails are still answered

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