All my lectures and critical writings are on pure literature. They are the only books I read which I can seldom remember. I have never done this at least in the last 30 years. However that was another choice I had to make. I believe when they are continually overworked at some type of work they can do and which interests them than they are merely taking care of their health.
Humans can drive at tremendous pace, even over a long period of years, if they choose to drive.
I run, work, and play largely by the watch and between them I have done little plain relaxing.