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The eight-hour workday is not based on the optimal number of hours a human can concentrate. In fact, it has almost nothing to do with the kind of work most people do now. Its origins lie in the Industrial Revolution, not the Information Age. However, this eight-hour movement didn’t become standard until nearly a century later, when, in 1914, Ford Motor Company astonished everyone by cutting daily hours down to eight while simultaneously doubling wages. The result? Increased productivity.

Research suggests that in an 8-hour day, the average worker is only productive for 2 hours and 53 min.