The important thing about little bets is that they’re bite-sized. You try one. It takes a few months at most. It either succeeds or fails, but either… - Cal Newport

In knowledge work, when you agree to a new commitment, be it a minor task or a large project, it brings with it a certain amount of ongoing administrative overhead: back-and-forth email threads needed to gather information, for example, or meetings scheduled to synchronize with your collaborators. This overhead tax activates as soon as you take on a new responsibility. As your to-do list grows, so does the total amount of overhead tax you’re paying. Because the number of hours in the day is fixed, these administrative chores will take more and more time away from your core work, slowing down the rate at which these objectives are accomplished. At moderate workloads, this effect might be frustrating: a general sense that completing your work is taking longer than it should. As your workload increases, however, the overhead tax you’re paying will eventually pass a tipping point, beyond which logistical efforts will devour so much of your schedule that you cannot complete old tasks fast enough to keep up with the new. This feedback loop can quickly spiral out of control, pushing your workload higher and higher until you find yourself losing your entire day to overhead activities: meeting after meeting conducted against a background hum of unceasing email and chat. Eventually the only solution becomes to push actual work into ad hoc sessions added after hours — in the evenings and early mornings, or over the weekend — in a desperate attempt to avoid a full collapse of all useful output. You’re as busy as you’ve ever been, and yet hardly get anything done.

Three to four hours a day, five days a week, of uninterrupted and carefully directed concentration, it turns out, can produce a lot of valuable output.

Here’s a case where someone successfully followed their passion,” they say, “therefore ‘follow your passion’ must be good advice.” This is faulty logic. Observing a few instances of a strategy working does not make it universally effective.