Great idea
Harvard (biased) kinda did that, tracked ‘em in 15min increments (24hr daily) for months:

The Job Is All-Consuming
CEOs are always on, … always more to be done. … worked 9.7 hours per weekday. … conducted business on 79% of weekend days [3.9 hours daily], 70% of vacation days [2.4 hours daily]. … CEO’s job is relentless.
2hr/day playtime, 6.9hr sleep:
We paid special attention to the 25% of time—or roughly six hours a day—when CEOs were awake and not working. … spent about half those hours with their families, … learned to become very disciplined about this.
(otherwise divorce presumably)
Running a large global company is an exceedingly complex job. … functional agendas, business unit agendas, multiple organizational levels, and myriad external issues. … constituencies—shareholders, customers, employees, the board, the media, government, community organizations … CEO has to engage with them all. … must be the internal and external face of the organization through good [&] bad.
Still be better at it than superbowl quarterback I guess
Anyway pretty different depending on whether you’re at Nestle cheating African mothers out of breastmilk or someone who sucks less huh