Here is some more interesting stuff on DCA. In her book Practical Formulas for Successful Investing by Lucile Tomlinson, Mrs. Tomlinson has a chart that shows how long it would take for a DCA plan to reach 40% profit, the time period varied from 2 1/2 years to 10 1/2 years long, most were about 5 years long. She seemed to be recommending stopping the plan at that point, as she goes on to say that after reaching 40% the plan tended to just follow with the market. Another thing she said was that If one were to combined a DCA plan with a Constant ratio plan one could get greater profits.