Since the 50s productivity has supposedly gone up by around an order of magnitude[0] in much of the world, so why isn't a four hour work week possible? Or more

Since the 50s productivity has supposedly gone up by around an order of magnitude[0] in much of the world, so why isn't a four hour work week possible? Or more to the point, how come two people working 40 hours a week with only one receiving pay was replaced by two working 70 hours a week at full pay, at a time when productivity supposedly dectupled? Say what you want about Tim Ferris and his devotees, but at least 4 is greater than 0, which is the number of hours you work if you've got an intergenerational fund of wealth slowly but surely extracting rents from the rest of the world through mortgages and dividends. [0] https://ourworldindata.org/grapher/labor-productivity-per-hour-pennworldtable?time=earliest..2017 https://ourworldindata.org/grapher/labor-productivity-per-ho...