Hubpages is a very popular website. Google crawls this site constantly.
Your Hub will likely be indexed on the first day it is published. Depending on timing, it can be within a few hours.
That does not mean your hub will ever show up in a SERP (search engine result page). That is all relevant to the user's query, the relevancy on your content, and the reputation of your page, among other things.
Hope this helps!