TRAPS:  You don't want to give a specific number.  Make it to low, and you may not measure up.  Too high, and you'll forever feel guilty about sneaking out the door at 5:15.

BEST ANSWER:  If you are in fact a workaholic and you sense this company would like that:  Say you are a confirmed workaholic, that you often work nights and weekends.  Your family accepts this because it makes you fulfilled.

If you are not a workaholic:  Say you have always worked hard and put in long hours.  It goes with the territory.  It one sense, it's hard to keep track of the hours because your work is a labor of love, you enjoy nothing more than solving problems.  So you're almost always thinking about your work, including times when you're home, while shaving in the morning, while commuting, etc.

TRAPS:  Blurt out "no way, Jose" and you can kiss the job offer goodbye.  But what if you have a family and want to work a reasonably normal schedule?  Is there a way to get both the job and the schedule you want?

BEST ANSWER:  First, if you're a confirmed workaholic, this question is a softball lob.  Whack it out of the park on the first swing by saying this kind of schedule is just your style.  Add that your family understands it.  Indeed, they're happy for you, as they know you get your greatest satisfaction from your work.

If however, you prefer a more balanced lifestyle, answer this question with another:  "What's the norm for your best people here?"

If the hours still sound unrealistic for you, ask, "Do you have any top people who perform exceptionally for you, but who also have families and like to get home in time to see them at night?"  Chances are this company does, and this associates you with this other "top-performers-who-leave-not-later-than-six" group.

Depending on the answer, be honest about how you would fit into the picture.  If all those extra hours make you uncomfortable, say so, but phrase your response positively.

Example:  "I love my work and do it exceptionally well.  I think the results speak for themselves, especially in .(mention your two or three qualifications of greater interest to the employer.  Remember, this is what he wants most, not a workaholic with weak credentials).  Not only would I bring these qualities, but I've built my whole career on working not just hard, but smart.  I think you'll find me one of the most productive people here.

I do have a family who likes to see me after work and on weekends.  They add balance and richness to my life, which in turn helps me be happy and productive at work.  If I could handle some of the extra work at home in the evenings or on weekends, that would be ideal.  You'd be getting a person of exceptional productivity who meets your needs with strong credentials.  And I'd be able to handle some of the heavy workload at home where I can be under the same roof as my family.  Everybody would win."