What’s going on here? It may show that people who work fewer hours are more productive. If you are forced to be in the office for 12 hours straight, you may get distracted from completing the task at hand; but if you know you can only be there for seven, you might be more focused. Workers who take it easy may also be less stressed. These ideas are not new. Adam Smith reckoned that: “[T]he man who works so moderately as to be able to work constantly, not only preserves his health the longest, but in the course of the year, executes the greatest quantity of works.”
From “Why it pays to work less” by Callum Williams in 1843 The Economist.
Thanks to my friend, Adam for the link.