Durban Poison comes from the Rift Valley on the Northwest tip of Kenya so that is pretty close to being central Africa.
As sativas go it is a fast flowering strain. Depending on what breeder’s genetics are picked they are claimed to run between 8 to 11 weeks. Most sativa strains are 12 to 14 weeks and a few are as long as 20 weeks, though good luck finding them even if you want them.
If you want a pure sativa and not a predominantly sativa cross and want as short of a flowering time as possible, something that is normally not something you get with a sativa, I would suggest Durban Poison. It is not as high in THC levels as most other sativas but it is still a potent strain.