Our general rule of thumb is about 4 hours or so to remove a duplicate article. This was posted yesterday, so, we'll leave it. It's obvious, some folks aren't here all the time. This gives them a chance to see articles that they normally may have missed. Thanks for your ping.
But if a poster simply searches for the article first, he can easily BUMP the existing one to bring it to everyone's attention again. There's really no need to post the same thing a second time, IMO.