I always like Richard Hamming’s take on hours worked: “ Knowledge and productivity are like compound interest.'' Given two people of approximately the same ability and one person who works ten percent more than the other, the latter will more than twice outproduce the former.” (From “You and Your Research”: https://www.cs.virginia.edu/~robins/YouAndYourResearch.html)

I started incorporating this thinking into my own work schedule, and I believe it to be true. I certainly found that I grew incredibly quickly in my abilities when I started working more (as long as I was applying the hours intelligently, which is admittedly its own trick)