In my opinion and experience there is no set time for Indexing then Caching. It can range from an hour to days! It does appear to me that it depends on many factors including: the topic of your article, how you are rating in Hubpages and how much you are 'liked' by Google. As I said this is only an opinion I have formed over my 2 years here on Hubpages. Others may have a more definitive answer.