@joe12joeApr 18.2011 — #I would say, there is no particular time for it. It always vary from time to time and they keep it unpredictable to make sure only quality website would get a higher PR. It is observed that normally they update the PR after every couple of months.
@kiddomanApr 25.2011 — #Someone told me that Google always upgrades the PR value per quarter in one year! I don't know too exact information about this!
@joe12joeApr 29.2011 — #Someone told me that Google always upgrades the PR value per quarter in one year! I don't know too exact information about this![/QUOTE]
Thats not true because they want to keep it natural. They want to rank only those website having naturally high link popularity.
@developerguruApr 29.2011 — #To be true there is no fix time for updating PR, but if you want your site PR to be updated then do the search engine optimization on regular bases.