ok i have a forum it has been one months since i started it ! it has a fair amount of alexa toolbar visitors ! after wating for around 15 days i submitted the site to alexa for getting a rank.. till now i havent got a rank ! where as the other sites of mine i got a rank without submitting within 7 days
But why would you want an Alexa ranking? Its only a rough measure of traffic - it won't get you any traffic. Better to concentrate on promoting rather than measuring your site.
It will take time, and unless there is a Alexa rank update, you wont be shown the exact rank of your site even if you get one