>There is no problem with my reasoning, because the world has settled on 35-40 hrs/week as being about the right balance.
There's a problem with that reasoning, because that number exists only because of Judeo-Christian traditions about the days that begin and end a week, the fact that 8 is a third of 24, the fact that the US had an active labor movement in the early 20th century, and the fact that US-style capitalism has been very influential around the world (largely for military reasons.)
Basing a chain of reasoning on the premiss that the status quo is the result of careful calibration over time is abandoning reason at the outset.
100 hours worked just fine, for owners.
A few questions about your larger assertion:
1) Could a 2-day a week dentist have a longer career than a 4-day dentist, ultimately leading to a higher saturation of experienced dentists?
2) Do you think that between a 2-day and a 4-day dentist of equivalent experience that one would perform better on an average workday than the other, or would they be equally affected by fatigue?
3) Do you agree that time for reflection and study are a requirement for skill-building, and do you think that there's any evidence pointing to an ideal ratio of reflection to practice that wouldn't advantage the 2-day dentist over the 4-day one?
