On February 11, 2009, we reported Google penalized Google Japan for selling links. It resulted in Google.jp having their toolbar PageRank score drop from a 9 to a 5. Shaun Anderson noticed today that Google.jp now returns a toolbar PageRank score of 8. He said prior to December 31st, it was still a PageRank of 5.
He asked if this means that most PageRank penalties last 11 months? No, I don’t think so – it depends on the situation. But in this case, Google clearly wanted to make a case of themselves and did so. 11 month PageRank penalty is a long time and can set a nice precedent for future cases.