There's a story that Roland Kirk held a note one night at Ronnie Scott's for two hours and 27 seconds but was denied the record for some reason. Joel Dorn wrote a KG-dissing liner note in the reissue of one of Kirk's CDs.
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according to Auhor, John Kruth in "Bright Moments, the life and legacy of Rahsaan roland Kirk" the night at ronnie scott was set up for the guinness book of world record people to attend, but inexplicably they failed to show (instead attending a very important pie eating contest). RRK held the note for 2 hours and 21 minutes.