An editorial in the NY Times this morning resurrected an old debate: How much of our time should be spent working? Labor unions in the US fought for a standardized 40 hour work week around the start of the last century (8 hours for work, 8 hours for sleep, 8 hours for what you will). In China, there's a 9-9-6 culture (9am-9pm, 6 days a week, 72 hours total). However in the 1930s, Kellog's (the Cornflake company) experimented with a 6 hour work day for employees, and found that better rested workers were more alert and productive. Numerous research studies on the optimal work week have supported and reinforced what Kellog's had found, the overall workforce is more efficient when they spend a shorter time at work and more time in rest and/or leisure.
Secondly, industrialization (and digitization) has always carried the promise of automating the human labor process and 'freeing us from the need for work,' which essentially means less jobs to go around for real people. By reducing the number of hours any individual is expected to work, we can better redistribute work among all people and bring down the unemployment created as machines take over. Unemployment, of course, is linked to a number of other social factors such as crime and public health.
One has to wonder whether our allegiance to the 40 hour work week is more through a symbolic devotion to tradition than it is common sense. It seems responsible for the proliferation of what David Graeber calls "Bullshit Jobs" - putting people to work only for the sake of putting them to work regardless of the actual demand for said work. People often derive a sense of identity from their profession. People stuck in these pointless and inconsequential jobs often struggle with burnout at higher rates than other professions, and Graeber links this to the essential meaninglessness of their work - and of themselves as workers. It seems that doing something meaningful for a few hours a day is highly preferable from a mental health perspective to performing a mostly pointless function for a full eight hours a day, five days a week. Together we can address the work that needs to be done, but we shouldn't invent work that doesn't need to be done just so people can have jobs, nor can we leave people without a source of income and identity as automation reduces the amount of work to go around. Decreasing the work-week is a good step in the right direction as we adapt to the changes technology is bringing to our society.