its def been a raging funkfest of a tune. i dunno, maybe you heard the wrong ones. the first one i remember hearing was at the Freakout at the Living Room in \'02 and that one def eclipsed the 15 minute mark.
actually its 13:09, but close enough.
pair that tune w/ score and you got an all out funkathon, everyone on the dance floor got down and dirty, and it was borderline obscenity.