Define what "time well spent" means to you: sit down, and think about what really makes you happy and gets you in the flow, without overthinking about how feasible the final outcome would be. Just think of your output and how it makes you feel to work on producing it.
Maybe this relates to my post from a few minutes ago about feeling punched in the face. Am I daily creating the maximum value that I think I can create, or as the article above says earlier, am I engaged in frivolity. I’d say that some nights of the week I’m just doing time killing things around the house instead of being the dad I want to be.
I think that one of the problems here is feeling like we always have to be doing something productive instead of doing the slow thing that we desire to do.