What Champs since the 70s held their title the longest?

Question

What Champs since the 70s held their title the longest?

Answer 1

julio cesar chaves - light welter champ '89 - '94

undefeated champ in 3 consecutive divisions '84 - ' 94

pernell whitaker -undefeated champion at 4 consecutive weights '89 - 97

azumah nelson - superfeather champ '88 - 94

Answer 2

Khaosai Galaxy from 84-91

Roberto Duran from 72-79

Marvin Hagler from 80-87

Carlos Monzon from 70-77

Larry Holmes from 78-85

Ricardo Lopez 90-98

Joe Calzaghe WBO champ since 97

Bernard Hopkins IBF champ 94-01 Undisputed 01-05.

Answer 3

marvin hagler (80'-88')

bernard hopkins (95'-05')

larry holmes (78'-85')

joe calzaghe (97'-?)

roberto duran (72'-79')