In the '90s, the increase in income was partially attributable to employees putting in more hours every year, whereas in the recent boom working hours per employee were effectively constant.

So the in the 2010's, income growth wasn't just bigger, it was of higher quality -> https://twitter.com/Noahpinion/status/1308790402082766849

Finally, the number of hours of the working week is irrelevant in the context of the "number of hours required to buy X" metric.