Andy Bowen fought Jack Burke in New Orleans in 1893.
The contest ended as a draw after 7 hours and 19 minutes - 110 rounds.
In June 1952 Sugar Ray Robinson fought Joey Maxim for the light-heavyweight championship; he was unable to come out for the 14th, although well ahead on points. But he did last longer than the referee who had to be replaced when he left the ring in a state of exhaustion at the end of round 10. The outside temperature that night was 104F(40C) and Robinson lost approximately 16lbs during the course of the fight.