Anthropologically speaking their was a lot of free time in ancient agrarian societies. I wouldn't be surprised if their is in fact a fair chunk of time that could be diverted to education if the resources were both available and accessible.
From a study of modern Asian and Pacific "free time" [1]:
"People in Cambodia (note the caveat of age – the sample is of those 5 years and older)
and Pakistan have the largest amounts of free time (Figure 1.4). Cambodians have more
than 16 hours of free time per day (1 000 minutes), whereas in Mongolia, which is the
country where people work the longest, people have only 13 hours (800 minutes) of free
time. Generally speaking, men have slightly more free time than women (Figure 1.5),
reflecting longer total working time for women (Figure 1.1)."[2]
[1]: "Free time" is defined as time not spent working, and can be subdivided as "personal care time" and "leisure time". Furthermore, personal care includes time spent sleeping and accounts for > 3/5 of "free time" usage in most cases.
[2]: https://www.oecd.org/els/soc/49306957.pdf
It's a really interesting article. It leads to the corollary of "How and why do people in poorer countries spend their leisure time differently then those in wealthier ones". My personal opinion is that the differences between both demographics where narrow down over time such as "Both poor and rich spend an average of 2hrs/day on Netflix".