How often does Google crawl?

Google's spiders frequently crawl the web to rebuild Google’s index. Crawls are based on several factors such as PageRank, links to a page, and crawling constraints like the number of parameters in a URL. Any number of factors can influence the crawl frequency of individual sites. The crawl process is algorithmic; computer programs which regulates which sites to crawl, how often to crawl the site, and the no: of pages to fetch from each site.
 
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