During the month of August, Microsoft Japan closed the office every Friday, sending their workers home with a three-day weekend and four-day work week ahead of them. Meetings were also limited to 30 minutes and online interaction was encouraged. Not only did this lead to a 40% increase in productivity and happier employees, but electricity consumption had been reduced by 23% and paper printing by 59% compared to the previous year.
Source: https://www.bbc.co.uk