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If you are #1 in Yahoo for a keyword it will usually last for months... 2 to 3... depends on when the next update is and when you got the listing.
You never have to resubmit a website after it is submitted. You need to read up on SE's... Once you are indexed, you are done as far as letting them know you exist... which is all submitted a URL to an SE is... Asking to be indexed... Perhaps no one else is linking to you.. So you submit so they know where to find you... If people do link to you, you don't even have to submit since they have already found you when they spidered your linking partners pages...
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