Wellington is 9 hours ahead of Nairobi
Best overlap: 8:00 AM to 9:00 AM in Nairobi is 5:00 PM to 6:00 PM in Wellington.
Keep meetings inside 8:00 AM to 9:00 AM in Nairobi — that maps to 5:00 PM to 6:00 PM in Wellington. With overlap this short — around 1 hour — a recurring slot at 8:00 AM in Nairobi (5:00 PM in Wellington) is worth its weight in gold. Because Wellington and Nairobi don't both observe daylight saving, plan to re-check the overlap around March and November.