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http://www.bluejeanscable.com/articles/how-long-can-hdmi-run.htm?hdmidept
The longest cable we have ever seen a compliance test certificate for is our own Series-1, which passed ATC testing at 45 feet under HDMI 1.3a (CTS 1.3b1); apart from that, the longest we've seen, after seeking these from all of the many vendors who try to sell us HDMI cable, are some 40-foot certificates issued under HDMI Version 1.2, which was a somewhat easier test to pass because of changes to the test protocols which came into effect with 1.3.