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What you can do is hope to get a "fresh tag" (the date you see by some url's presented in the serp's (search engine result pages))
A thread that covers it very good is Google Updates and Everflux, the Monthly Mid-Cycle Changes [webmasterworld.com]
Also, Google updates the cache, every time they do a complete update of the index.
Also welcome to the Board, remember to read Paynt's welcome message [webmasterworld.com]