Kamaru Usman was UFC welterweight champion from March 2019 to August 2022 , while Khabib Nurmagomedov was UFC lightweight champion from April 2018 to March 2021. That means Usman and Khabib were champions at the same time for about 2 years and 11 months — roughly 35 months.

Quick timeline

  • Khabib: became champ in April 2018, retired and vacated the belt in March 2021.
  • Usman: won the title in March 2019 and lost it in August 2022.

Overlap

  • Their championship overlap ran from March 2019 until March 2021.
  • So if you’re asking “how long was Usman the champ when Khabib was the champ?”, the clean answer is about 2 years of overlap, or just under 3 years depending on how you count the months.

TL;DR

Usman and Khabib were champs together for around 35 months.