10-2-1996 On the occasion of a mass rally held during the visit of President Fidel Castro to the city of Santa Clara, Villa Clara Province, Castro delivers a speech that lasted an hour and 39 minutes. LONGEST SPEECH: Castro's holds the Guinness Book of Records title for the longest speech ever delivered at the United Nations: 4 hours and 29 minutes, on Sept. 29, 1960. His longest speech on record in Cuba was 7 hours and 10 minutes in 1986 at the III Communist Party Congress in Havana.