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 versio