Google says:
Quote:
Google's spiders regularly crawl the web to rebuild our index. Crawls are based on many factors such as PageRank, links to a page, and crawling constraints such as the number of parameters in a URL. Any number of factors can affect the crawl frequency of individual sites.
Our crawl process is algorithmic; computer programs determine which sites to crawl, how often, and how many pages to fetch from each site. We don't accept payment to crawl a site more frequently. For tips on maintaining a crawler-friendly website, please visit our webmaster guidelines.
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How often does Google crawl the web?
If that is not an issue for you, then no need to worry. And this is only one of many reasons why PageRank is important. NOT THE TOOLBAR THOUGH!