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"JohnMu from Google posted in a Google Webmaster Help thread that Google typically crawls a site's robots.txt file on a daily basis.  This is the first time (at least that I can remember) I have seen a Googler make a statement on the crawl frequency of robots.txt files.JohnMu said:We usually only check the robots.txt file once a day for most sites, so I assume you were just still seeing the version that we fetched yesterday.I have not validated this with my sites log files, but that is not the point.  The point is a Googler said, on a general level, how often Googlebot will refetch a site's robots.txt file. Forum discussion at Google Webmaster Help."^^<http://www.w3.org/2001/XMLSchema#string>
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