how much money would you pay for a clone of yourself that didn’t need to eat or sleep and operated at whatever your peak productivity is 100% of the time?

There’s a beauty and necessity (for our mental health) in simple things like enjoying a good meal. 

Without the contrast of an unproductive day, exhaustion or the like - how would we know when we are at our peak?

Hmmm, yes that would work. I wonder what the consequences are to our mental health when we try to measure everything in our lives. Is the desire to measure and so perfect our lives a way to control whatever we can - life’s course is inherently unpredictable.