"And no doubt, many will seize on this as socialism or worse. Many will object to being told that 21 hours is normal, or 80 hours is too much. But consider what John Maynard Keynes, (whose theories underpin much of the global response to the financial crises), said in 1930 about the goal of future societies. Keynes thought that by the start of the 21st century, we would work only 15 to 21 hours a week, and we would instead focus on “how to use freedom from pressing economic cares.” As NEF writes: “Keynes was wrong in his forecast, but not at all wrong, it seems to us, to envisage a very different way of using time."

The Case for a 21-Hour Work Week - Yahoo! Finance