Of course, but what I'm not convinced by is the idea that if you lop off two of those hours it all comes out of the goofing off pile instead of the hard work pi

Of course, but what I'm not convinced by is the idea that if you lop off two of those hours it all comes out of the goofing off pile instead of the hard work pile. My own experience when I work a short day does not match that. I set my own hours, so if I thought I could be just as productive with fewer office hours I'd be all over that.