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I currently have around 50, which creates about the same about of blank lines before the actual html content. So far it has not made a slightest bit of difference in any of the SE's.
There was a time developers used to place 100's of blank lines before their HTML content so that it confused the beginner as to where the source resided, again this had no direct impact on listings. So unless things have changed I don’t think this makes the slightest bit of difference :)
HTH,
-gs