I heard in an interview that it took Christopher Tin a month to make Baba Yetu. I don't know if he had the song structure already in his mind. But it did sound like from the interview that he spent alot of time getting the "chorus" main part down. Like a week or something. He was on nitro game injection if you are curious about it.
Updated again. v3:
Changes
2nd chorus is different.
Choirs are the same, I don't have a library with choirs that matches the song while sounding better/more realistic.
Some adjustments to mixing and mastering.