>>941866240
Ancient Egypt roughly 2700 years,
Kush (Nubia) roughly 1400 years,
Aksum (Axumite empire) roughly 900 years,
Ethiopian Empire roughly 700 years though they claim to go back to king Solomon,
Kanem-Bornu empire roughly 1200 years,
Ghana empire roughly 900 years,
Mali empire roughly 365 years,
Songhai empire roughly 160 years
Like I said, there is more overlap than you'd think as people moved freely within and between empires. Oh, but you didn't know Africa had empires with kings, queens, emperors and empresses to begin with, right?