Nairobi is 3 hours ahead of Reykjavik
Best overlap: 8:00 AM to 3:00 PM in Reykjavik is 11:00 AM to 6:00 PM in Nairobi.
The hours that work for both Reykjavik and Nairobi are 8:00 AM to 3:00 PM (Reykjavik) and 11:00 AM to 6:00 PM (Nairobi). 7 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved.