A question about PR update

So, according to what everyone here say, the PR is updated once in every
3-5 months right?

So, my question is, when google decide to update the PR, does it get updated
on all the sites on the web together, or does it just happen randomly?

And, is there a way to predict when the next Pr update is going to be?

 

When google does update the PR it usually takes about 1 week for every site across the net to update.

The next update is going to happen in a couple weeks, prolly 2-3

 

Wish this is true. Last time they were out of "schedule"

 

I doubt there is any set schedule for the PR update anymore. It'll happen when Google is good and ready to do it again.

 

If we are lucky in 2 months or so

 

The Pagerank data gets "pushed" to one datacenter and it will display the new results. This data then gets propagated to all the other datacenters over the following few days.

Yes.

 

That would be the simple answer, mind elaborating your theory?

 

Crawl frequency, Google does a deep crawl approximately 3 weeks before the export in order to obtain a complete capture of your backlinks to calculate your Pagerank.

 

And how do you know when google is crawling?

 

Crawl frequency increases, my guess is you can spot it in your server site stats... But then again you might have a lot of new content

 

i think there is no exact answer for your question. they are updating tbr every 3 months because they want to update it every 3 months