If you’re anything other than purely black African, it may be as recent as forty or fifty thousand years ago, when one of your ancestors was actually a Neanderthal or Denisovan, who interbred with a member of the Homo Sapiens species.
Of all human beings alive today, only indigenous sub-Saharan Africans are pure Homo Sapiens. Everyone else has between 1–4% Neanderthal or Denisovan genes in their DNA—with Europeans and Middle Easterners having the highest percentage. See, for example,
(Originally written in reply to a question at Quora.com)