Sentient robots, being way more intelligent that the Owner class, would take the current ownership system over and as our new overlords make humans to work only the nunber of hours that yields peak returns, which is, at least for intellectual occupations, somewhere around 7h per day.

I suggest people ponder on the possibility that we are actually living in a Dystopia. Not the worst Dystopia that we can conceive, but likely for most a worst state of affairs that a baseline of, say, being a nomadic hunter gatherers (even though we live more we get significant less enjoyment from our lives)