I read many about this but still not get it.
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nope - impressions are merely the number of people who looked at your hub - time doesnt matter; cpm is based on the number who clicked on an ad from your site -- 2 entirely different stats, and the correlation will vary based on your content.
Bah, these things get more complicated by the day. I swear. Just as I think I got it... thank you cascoly for clearing that up.