Just once is more than enough. Even that isn't necessary

Google finds your site by reaching it from other sites that link to you - thus the nature of the world wide web - a giant network of hyperlinks. Therefore, the key to getting high rankings on google is to get lots of other sites to link to you

The more sites, the higher your ranking. The foundation of google's search algorithm is: if lots of sites link to a particular website, that website must be pretty important, so we should give it a higher ranking
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The Queen of DaniWeb
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