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Wikipedia vandalism

I have one data point for how long an act of vandalism stays on wikipedia:

On the page about fictional computers, at 17:23, 17 July 2007 a user from IP 82.7.212.36 added vandalism to the Before 1950s section of the article. It has been there until I removed it on August 12 2007.

So, this particular piece of vandalism lasted 27 days.

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