Mo Putera comments on The Dutch are Working Four Days a Week

[Mo Putera]

Famously, a hundred years ago Keynes predicted that by now people would be working just fifteen hours a week. That hasn’t quite happened

This tangentially reminded me of Jason Crawford’s essay on this, which pointed to this interesting paper:

Nicholas Crafts came up with these estimates for expected lifetime hours of work for men aged 20:

Year	Work hours	Other hours
1881	114,491 (49%)	119,269 (51%)
1951	94,343 (33%)	191,429 (67%)
2011	70,612 (20%)	276,522 (80%)

A reduction from 49% of an adult life spent working to 20% is almost as great as a reduction from forty hours a week to fifteen.

This was due to a combination of factors: working hours per week dropped by nearly half, child labor waned, and retirement was invented plus life expectancy increased.

[Mateusz Bagiński]

Child labor shouldn’t have an influence on expected life time (non-)work hours for a person of age 20, as they’re no longer a child, right? Or am I missing sth?