Joe Louis held the world Hvywt. title the longest of all time. Louis defended the belt successfully 25 times, a record.
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"Chris John is the longest-reigning champion in boxing having held the WBA featherweight title since September of 2003. "
Joe Louis did, 11 years and 8 months, and he made 25 defenses and still found time to serve in the army for four years in between.