Earlier quoted context omitted.
Total hours worked in the US has DOUBLED since then. https://fred.stlouisfed.org/series/B4701C0A222NBEA And more work is done part-time(usually by those are unable to work full time jobs) https://alfred.stlouisfed.org/series?seid=B4701C0A222NBEA&ut...
Total hours worked by people who are being paid. If you’re working on a farm but you’re a farmer’s wife you’re not being paid. Female liberation resulted in a very large increase in the labor force, a much less drastic rise in hours worked than in paid labor hours.
https://www.stlouisfed.org/open-vault/2019/july/nonfarm-payr....
That said, I doubt it's enough to offset the growth in population among workers.