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The actual search system gets updated less often, it might be a matter of weeks.
However, getting in the search is not important, since not many people use it, or they think it does something really fancy. It's very simple minded.
If you want to check --- put in your website name only - e.g xyz.com and search on that.
IIRC the Google Directory updated from the RDF about 10 times in 2002, but only twice in 2003. Here's to hoping they get back on track in 2004.