What was their life expectancy?
I worked remotely for a whole year and it was 100x better than working in an office. I can only imagine what only working 8 hours a week is like.
You won't have much free time if you and your family can only aspire to reach the ripe old age of 30, if you manage to be the lucky ones who are lucky on the infant mortality lotto.
That was never the case though; ancient societies had much lower life expectancy at birth because they were very likely to die in early childhood. People who made it to adulthood, sure, didn't live as long as today on average, but the difference is much smaller than life expectancy at birth numbers would suggest. You seem to recognize the high infant mortality, but not understand how it affects the other stats like life expectancy at birth.
You're desperately trying to avoid the question. Their free time doesn't mean anything if they die in their 30s while living a life where they are forced to endure famines and the deaths of loved ones for avoidable problems such as lack of medical care.
Yes, there is - their age.