Africa
We track 54 countries in Africa. The average current leader has been in office 3,836 days (about 10.5 years). The longest-serving is Teodoro Obiang of Equatorial Guinea, at 17,196 days. By the Regimes of the World classification, 15 countries count as democracies and 39 as autocracies.
Regime classifications follow the Regimes of the World scheme (V-Dem), via Our World in Data.