I think when this conversation comes up, a lot of different things get overloaded. There are classes of "work" where output linearly scales (more or less) with input: For example, if you;re a truck driver, time spent with your butt in the driver's seat probably corresponds very tightly to your mileage per day and even deliveries per day (and therefore profit)

But given this is mostly a software-centric message board, software engineering and tech in general I have not observed much correlation at all between amount of input (work) and output (profit, success, happiness, etc). The expanse is wide open, the decision-tree of ways to approach a problem is nearly infinite, and choosing an approach to go down almost always incurs an opportunity cost of solving the same problem in a much better way. I've seen this a lot with lots of founders: They are so motivated and have enormous reserves of energy to "work", and while they are legitimately "working" in a certain sense (writing code, hustling for investment, planning business strategy, etc), it's often work that functions like a greedy algorithm: Stuck in local maxima, stuck in ruts, inflexible, etc and having a very hard time pausing, reflecting, and being judicious with their time, energy and focus. I call this the "Bias of Doing Work"