Kobayashi - 6:41 pm on Sep 30, 2010 (gmt 0)
Couple weeks, wow. I have noticed on a few occassions that up to 3 days after I lowered by max CPC I continued to get charged click prices that were higher than my new max CPC but eventually they went down. There is no excuse for two weeks or even 3 days. I'm pretty sure Google changes are effective within 6 minutes.