Google was showing up pages with affiliate ID parameter in the search results. After some research on how to disallow this, I came across URL parameters in Webmaster tools. I set the parameters for ?a_aid= to Representative URL/No, doesn't affect page content. It's been two weeks since I made the change but Google still shows these results and in Webmaster Tools in the "Effect" column it still shows "None."
How long should I wait for the changes to take effect?