I did a search on the product and found some information that may be of help to you. The link to the search is at:

http://search.yahoo.com/search;_ylt=A0geu5D_31dHD4IA3kdXNyoA?p=How+long+does+it+takeProvillus+to+work%3F&y=Search&fr=ks-ans&ei=UTF-8