No new facts or research in this article. Just more evidence of a trend to discourage long working hours to promote productivity.
There's been a flurry of recent coverage praising Sheryl Sandberg, the chief operating officer of Facebook, for leaving the office every day at 5:30 p.m. to be with her kids. Apparently she's been doing this for years, but only recently "came out of the closet," as it were. What's insane is that Sandberg felt the need to hide the fact, since there's a century of research establishing the undeniable fact that working more than 40 hours per week actually decreases productivity.
... nobody should be apologizing for leaving at work at a reasonable hour like 5:30 p.m. In fact, people should be apologizing if they're working too long each week–because it's probably making the team less effective overall.
via inc.com