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Before hiring me to do SEO, a client re-launched their site and did not 301 the old URLs to the new. Only the home page URL stayed the same. For a month after the re-launch, the old URLs returned a 404. For the next month, all 404 pages (basically any non-existent URL) were 301'd to the home page. Finally, 2 months after launching, they properly 301'd the old URLs to the new. Now, the new URLs are not ranking well. I assume it's too late to realize any benefit from the 301's, just checking to see if anybody has any insight into how long Google keeps trying to crawl old/404/improperly 301'd URLs. Thanks!