We had seen earlier that Google is now indexing your site quick and fast as never before. More of this has got to do with the frequency of content change that’s happening in your site. And blogs are at an advatange here compared to other static paged websites.
This is a screenshot from my indexing results I took this morning. Soon after I had published an article (Reader’s Questions), the article was absorbed/indexed by the Google bot. It took only 39 minutes.(See the screenshot) The indexing must have been done earlier but I checked it only at 39 minutes late.
One more proof that you can decide yourself how often the crawler should visit your site. Just give it food every often and the poor crawler will visit frequently.