Hours worked vs. taxes paid

Sean at Cosmic Variance just put up a post on the Laffer Curve. Very interesting concept. But as Sean mentions, who knows whether the assumptions that come into the general Laffer Curve theory or those made by the study referred to in Sean's article are correct.

By reading the comments over at CV, I have a question. If you could keep more of the money you earn i.e. lower taxes, and assuming that you could chose how many hours a day you could work, would you work longer hours to increase your personal income, work the same hours which after all means more income anyways (though not as much as the first option)? or would you work less hours (enough to match your current income)?