I'll bite. I didn't downvote, but I feel that your thinking is relatively binary and doesn't take the dynamism of humans into account. I can throw study materia

I'll bite. I didn't downvote, but I feel that your thinking is relatively binary and doesn't take the dynamism of humans into account. I can throw study material onto a playlist and hit the gym. I can go to my kid's dance recital and hit up the other bored parents there with business prospects. I can turn over programming ideas while I'm taking a shower. In many cases, taking a break from the task at hand has great effects on resetting the fatigue that builds up when you focus too hard on a narrow set of problems. I wouldn't consider those breaks a "cost" when they're ultimately used to allow you to more efficiently use your time while at the same time reducing burnout. Don't get me wrong - time is finite and it shouldn't be squandered. But at the same time, perhaps what looks like a walk around the block is much more than a 15 minute "cost".