If your boss expects you to work longer hours than your personal life should allow, you have options. As soon as your professional life overshadows your personal one, analysts suggest that you should speak up. If you want to get out of working long hours without looking like a slacker, the best way to do so is to prove that you deserve a break. However, keep in mind that tact is always necessary when asking the boss not to work you to death.
See "The Workplace: Overworked? You have options", Matt Villano, International Herald Tribune, April 17, 2006