Companies that participated could adopt different methods to “meaningfully” shorten their employees’ workweeks — from giving them one day a week off to reducing their working days in a year to average out to 32 hours per week — but had to ensure the employees still received 100 percent of their pay. At the end of the experiment, employees reported a variety of benefits related to their sleep, stress levels, personal lives and mental health, according to results published Tuesday. Companies’ revenue “stayed broadly the same” during the six-month trial, but rose 35 percent on average when compared with a similar period from previous years. Resignations decreased. […] Of the 61 companies that took part in the trial, 56 said they would continue to implement four-day workweeks after the pilot ended, 18 of which said the shift would be permanent. Two companies are extending the trial. Only three companies did not plan to carry on with any element of the four-day workweek. […] There is precedent for a large-scale change in the standard workweek: As The Washington Post has previously noted, before the Great Depression, it wasn’t uncommon for employees in the United States to work six-day weeks. The 40-hour workweek was first codified into U.S. law in 1938. The argument put forward by groups such as 4 Day Week Global is that “we’re overdue for an update.” (Annabelle Timsit, The Washington Post)