I think it's incorrect to equate working long hours with passionate pursuits like learning something or working on a side-project. Good motivation, almost always, never let's you burnout in real terms. Hell, I love creating something after work and counterintuitively, it makes me feel happier than stressful. But, I don't count this as work, it's kind of a break for me.
In most cases, the effort put is not in the right direction. Stroking the brush the same way a thousand times will never make you a better painter if it's not accompanied with a study of better techniques and introspection into your mistakes.
I can't deny that sometimes you can have enough motivation to have be 'the right kind of productive' for long hours but working on the same project necessitates a break. The break allows you to work out better approaches, which is not thought out by most managers.
I would be susceptible of any claim that working long hours enabled someone to learn more. I have often encountered them in my career, and it's never the case.
In most cases, the effort put is not in the right direction. Stroking the brush the same way a thousand times will never make you a better painter if it's not accompanied with a study of better techniques and introspection into your mistakes.
I can't deny that sometimes you can have enough motivation to have be 'the right kind of productive' for long hours but working on the same project necessitates a break. The break allows you to work out better approaches, which is not thought out by most managers.
I would be susceptible of any claim that working long hours enabled someone to learn more. I have often encountered them in my career, and it's never the case.