Don't ever forget this mantra during recession.
If your boss doesn't see you much, it would be very easy for him to decide never to see you again.
People who are regularly seen before and after regular work hours will have a better chance at surviving in the office.
In a lighter vein, it would also help if you have a secret affair with someone in your office; it's easier to pass time that way and motivate yourself to come to office early and leave late (radical idea but interesting, isn’t it?).
Also see: Are you employment-ready?