> It's safe to say 32 hours of work does not produce more than 40 hours.

This is too simple. 32 hours of huge output may produce more than 40 hours of light output. If the machine/human output is a constant, then sure you’re correct. But that’s not true. And that’s my point. It’s relative and fluid. It’s relative to the work, the individual, the health of the individual, the weather that day, and on and on.