Nairobi is 9 hours behind Wellington
Best overlap: 5:00 PM to 6:00 PM in Wellington is 8:00 AM to 9:00 AM in Nairobi.
Book within 5:00 PM to 6:00 PM Wellington time (8:00 AM to 9:00 AM in Nairobi) and both teams will be at work. The overlap barely stretches to 1 hour, so reserve it for what really needs a live conversation and handle the rest async. Don't be caught out by clock changes — Wellington observes daylight saving and Nairobi doesn't, so the offset varies by an hour through the year.