North America
We track 23 countries in North America. The average current leader has been in office 1,596 days (about 4.4 years). The longest-serving is Daniel Ortega of Nicaragua, at 7,173 days. By the Regimes of the World classification, 10 countries count as democracies and 5 as autocracies.
Regime classifications follow the Regimes of the World scheme (V-Dem), via Our World in Data.