I've often felt that a 5 day work week is about availability , not raw productivity. I could easily compress all of my weeks work into 30 hours or less, but that's not what my managers and clients value. What they value is the fact that I'm making progress on my tasks, and that my reachability is not preventing anyone else (people above me or below me) from making progress on their tasks
He doesnt do much other than be available 12-16h 6-7days a week. It's taking more toll than one would expect.