After how many impression will get the revenue in blogger.com

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Hi friends, I have created three blogs in blogger.com, added or posted so many new post on them. In statistic when I see then on that it shows me the good response that means every where my blog has been viewed. My question is that then why not some revenue has raised in adsense. I have linked with that also. Please if you have some suggestion on this then you are welcome to give me suggestion for getting more advance my blog to get more and more revenue. Thanks in advanced for your reply. Your friend.