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A measure of one's ability to play extended fast sections in Guitar Hero and Rock Band before before becoming utterly exhausted and not being able to finish the song.
"I can't make it through Raining Blood - I can nail the main section for the first thirty seconds, but then my vision begins to narrow and my lips begin turning blue."

"Dude - sounds like you need to work on your Guitar Hero endurance."
by Scott Shumaker February 12, 2008
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