I have a site with PR4 for its domain and index page and PR3/4 for other main pages. Recently my PR is still 4 for the domain but the index page and the other main pages is now unranked!!
Count 2 or 3 months after the last PR update. So if the PR update is December 31,2009 then the next PR update will be on last week of February or last week of March 2010.
Can't tell you the exact date, I don't think anyone outside of Google could. But they happen about every 3 - 4 months and the last one was just recently. Regards, http://xsitepro.cybersprout.com Gtoo
There is no change in PR of my website. It was expected as not additional backlink was created. It was 3 earlier and is 3 now as well.
last one was October so next one is due roughly mid to late January as it is approximately every 3 months