You are missing a crucial point: Until very recently, it was completely normal to have at least one person per household completely dedicated to household stuff, like cleaning, tidying, shopping, childcare, etc. Nowadays, both parents have to work full-time, and are expected to take care of that in addition to everything else.

Also, there is lots of research showing that subsistence farmers actually worked both fewer days, as well as fewer hours, compared to the modern standard.

8+ hours workdays are not natural in any way, they were introduced through the industrial revolution.