Great quotes from this article:

We chronically confuse the feeling of effort with the reality of results—and for anyone working in a creative field, that means the constant risk of frittering time and energy on busywork, instead of the work that counts.

Call it the “Effort Trap:” it’s dangerously easy to feel as though a 10-hour day spent plowing through your inbox, or catching up on calls, was much more worthwhile than two hours spent in deep concentration on hard thinking, followed by a leisurely afternoon off.

In fact, though, if you can do your job brilliantly and still leave at 3 p.m. each day, a really good boss shouldn’t object.

Nobody Cares How Hard You Work – 99u