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Thanks Maurizio. What I am really most concerned about is submitting hundreds of sitemaps to Google and giving them concern that we might be spamming them. This is why I am considering the second approach where we would submit 6 sitemaps at a time which would total no more than 300,000 links rather than giving them 200 plus sitemaps with 10 million links. I should have been clearer in my reason for this question.  The main goal here is to not have Google freakout because we just gave them 10,000,000 links at one time.