Hi, apparently, your task seems to be completed in 25 days. But if you provide more information about your requirement if needed, the time can be fluctuated. please see my profile to see my experience about e-commerce sites, specially B2B sites.
I have made a clone of www[dot]1shoppingcart[dot]com. I can provide the url of my task if you are interested.
Thanks in advance and waiting for your reply.
--Web Insect