Their earlier time interval was 3 months but if the last 2 months trend is anything to go by, you can expect one at the end of every month! Regards, RightMan
Don't be silly, no one know the exact day of Google updated the PR. You will get what you pay, i mean link building...
No one knows for sure except for Google them self, Just focus on your website SERP's and keep on building backlinks then PR will follow
when google decides to do a PR update. Please stop posts like this, PLEEEEEEEEEAAAAAAAAAAAASSSSSSEEEEEE !!!!