Recently took over managing a site for a non-profit which was using the dreaded Wix. Switched over to Wordpress but now Google still has the old URL's with the hashtag.  Can't forward them in .htaccess and don't want to add javascript for fear of slowing down load time.

I found a solution that seems like it will take hours and hours of work. I found the solution at http://www.thedriversgarage.com/web-technology/redirecting-hashbang-urls-wix-urls/ but it seems like it would take hours with all the URL's.

I submitted an XML sitemap in Google webmaster tools.

My question is, how serious could this effect SEO for my site?  Google accepted the new sitemap but still has the old URL's in SERP. How long does this generally take to remove? Will the hashtag URL's penalize the site for duplicate content? If so is there a way to tell Google the homepage without hashtags is the page with original content? Sort of like the rel=canonical tag which I know wont work as the hashtag URL's all redirect to the homepage so they will all have the tag.

Does Google ignore the hashtag?  Could there even be a benefit to this, possibly the homepage getting more page authority due to the redirects?  How serious is this?  Thanks in advancing.