Hey Dude, No one can provide you proper timing of Google update because no one have proper timing details of Google update, if any one have then don't go through that. But may be last update of Google has done in Dec, because my Website page rank updated in Dec.
Hi, But i noticed also PR update after December for inner pages and for subdomains. Few of my inner pages Rank update after few days. I noticed Let my site have few pages with name of 1,2,3 and 4. In last December 1 have PR1. But after two three days i saw that PR of 1 is showing as NA and page 3 have PR1. I think its changed after few days according to link building. NOT at homepage but i am sure about inner pages. May be some webmasters noticed here also about this. Thanks