The Joe Louis heavyweight duration record of 11 yr 252 days stands for all divisions.
Due to the numerous Boxing Associations (There are 5 with about 12 divisions in each!) that exist these can vary but very generally speaking the present boxing divisions are
Joe Louis's reign started on 22 June 1937, when he knocked out James Joseph Braddock (USA) in the eighth round at Chicago, Illinois, USA, until announcing his retirement on 1 March 1949. During his reign Louis made a record 25 defences of his title.
Comments below may relate to previous holders of this record.