When it comes to learning a new skill, the Law of Diminishing Returns is at play. Students who regularly take breaks, meet friends, get enough sleep, and do exercise seem to do just as well — if not better — than students who use every second of their free time studying.
Learn to code like a Korean student learns English
Stephen Mayeux
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This is similar (or the same?) principle as “Sharpen the Saw”, from 7 Habits of Highly Effective People. If you’re just constantly trying to plow ahead, you’re not going be that successful. You need to take the time to step back and assess where you are, and if you could do something more effectively.