The five-day workweek is dead

The five-day workweek is so entrenched in American life that everything, from vacation packages to wedding prices to novelty signs, is built around it. When you live it every Monday through Friday, year in and year out, it can be hard to imagine any other way.

But there’s nothing inevitable about working eight hours a day, five days a week (or more). This schedule only became a part of American labor law in the 1930s, after decades of striking by labor activists who were tired of working the 14-hour days demanded by some employers. Indeed,...