LucidSW - 9:53 pm on Jul 24, 2009 (gmt 0)

Yes, it's normal. You can't avoid it. Sometimes, it takes a while but normally is fairly quick, like hours. Seems to be a problem lately. Don't know what is happening, ads getting stuck in the system or being missed, falling through the cracks somehow. If you've waited three days, I'd call Google. Should fix the problem fairly quickly.