I think he's been a manager for too long. I can see the same reasoning coming from my father (who owns an architecture firm).

With business you're spending a lot of time in meetings, travelling for business or in various phone calls. To be sure, these things are taxing, but I get the feeling that one can do many more hours of these things in a week than one can with something like programming.

From that (business) perspective it seems natural that everyone else should work more. And I think that it's here where a wise manager will work longer (if it is in his or her interest, of course), but will not require the same of people whose jobs cannot support such a routine.

And I agree, Jason's advice is, in general, very sound.