A billboard with working schedules hangs from the wall as Mar Parreno, left, and Mario Perez, two of the founders of the Factoria 5 digital design company, work in their office in Madrid, Monday, Feb. 25, 2013. A groundbreaking experiment with the four-day workweek has made lasting changes among British companies, with an extensive study showing the majority of the firms that participated in the trial making the shift a permanent one. (AP Photo/Daniel Ochoa de Olza, File)
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