“Updation?”

Neat word.

Google’s updates for searches happen daily, but you’re going against sites that have been active and visited for years. The average amount of time for a site to “get noticed” on Google Searches is about four to six months, depending on how much traffic the site gets.

Don’t bother about update, just concentrate on getting quality backlinks, update your contents, try to top your keywords….that all i will suggest you.
Forget about toolbar PR update, due to it’s spamming they are just ignoring it.

my own experience shows 2 - 3 months.
this does not matter because we can not control it.
work on your SEO and be patient.

PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page’s value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves “important” weigh more heavily and help to make other pages “important.”

Important, high-quality sites receive a higher PageRank, which Google remembers each time it conducts a search. Of course, important pages mean nothing to you if they don’t match your query. So, Google combines PageRank with sophisticated text-matching techniques to find pages that are both important and relevant to your search. Google goes far beyond the number of times a term appears on a page and examines all aspects of the page’s content (and the content of the pages linking to it) to determine if it’s a good match for your query.

Toolbar PageRank updates generally happen about 3-4 times per year, but watching and wondering about the next update is a waste of time. The real PageRank of a page is updated constantly, and more importantly, has little impact on your visibility in Google’s SERPs. PR these days is more about how often and how deep your site will be crawled.

If you want semi-accurate backlink details from Google, make sure you’ve signed up for Webmaster Central. The backlink counts in there are updated regularly.

Hope this helps.