The author makes a great point that a longer workday isn't necessarily a more productive one. I feel best and seem most productive when work a normal workday at the office (about 8-9 hours) and don't do any more work once I'm home. I don't seem to get a lot more done when I work 10+ hours in a day -- I feel guilty I'm not paying attention to my family and feel like I'm still not ahead of things at the office.