How much work does a husband create?

http://www.ns.umich.edu/htdocs/releases/story.php?id=6452

Apr. 3, 2008
ANN ARBOR, Mich.—Having a husband creates an extra seven hours a week of housework for women, according to a University of Michigan study of a nationally representative sample of U.S. families.

For men, the picture is very different: A wife saves men from about an hour of housework a week.
...
Certainly there are all kinds of individual differences here, but in general, this is what happens after marriage. And the situation gets worse for women when they have children."