Indeed, I noticed that myself; also not far off the sleep/wake cycle (around 7:17 hours). And (modern) retirement vs pre-retirement (say 20:60 years), at a pinch. I didn’t pursue the thought when I realized that the annual job vacation:work is a very different ratio, so it doesn’t seem to work at all timescales. But nonetheless there might be something going on—needs more thought.
Indeed, I noticed that myself; also not far off the sleep/wake cycle (around 7:17 hours). And (modern) retirement vs pre-retirement (say 20:60 years), at a pinch. I didn’t pursue the thought when I realized that the annual job vacation:work is a very different ratio, so it doesn’t seem to work at all timescales. But nonetheless there might be something going on—needs more thought.