Nairobi is 7 hours behind Melbourne
Best overlap: 3:00 PM to 6:00 PM in Melbourne is 8:00 AM to 11:00 AM in Nairobi.
Target 3:00 PM to 6:00 PM in Melbourne, which lands at 8:00 AM to 11:00 AM for the Nairobi side. Nairobi is 7 hours behind Melbourne, so the practical overlap is about 3 hours — generous enough for meetings, tight enough to be worth booking ahead. For part of the year the maths changes: Melbourne observes daylight saving, Nairobi does not, shifting the overlap by an hour.