Microsoft tested out a four-day work week in its Japan offices and found as a result employees were not only happier – but significantly more productive.

For the month of August, Microsoft Japan experimented with a new project called Work-Life Choice Challenge Summer 2019, giving its entire 2,300 person workforce five Fridays off in a row without decreasing pay.

The shortened weeks led to more efficient meetings, happier workers, and boosted productivity by a staggering 40%, the company concluded at the end of the trial. As part of the program, the company had also planned to subsidize family vacations for employees up to ¥100,000 or $920.