http://www.theguardian.com/news/datablog/2015/sep/23/go-home-on-time-day-work-employer-good-for-you

It’s past 5pm on Go Home on Time Day. Here’s why you should take that advice.

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There is a lot of evidence that the number of hours worked does not equate to how much you are getting done. With the OECD countries above, there is a statistically significant negative relationship between the average hours worked and the amount of money made per hour worked. In other words, the countries with longer working hours tend to have less economically productive workers.