It's tough but I find that I tend to procrastinate quite a bit sometimes. So it does require me to focus on some things so I can get everything done but I wouldn't be surprised to see people burned out if they were always focused. So it's tough to really strike a good balance between everything.
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I think there are "low level" productive exercises too, that don't take much focus. It can be like stacking shelves at a supermarket, it doesn't take much thought, but it still earns :)