Hamburg is 2 hours behind Addis Ababa
Best overlap: 10:00 AM to 6:00 PM in Addis Ababa is 8:00 AM to 4:00 PM in Hamburg.
Target 10:00 AM to 6:00 PM in Addis Ababa, which lands at 8:00 AM to 4:00 PM for the Hamburg side. That's a roomy 8 hours of common time each day, so finding a slot that suits everyone is rarely a problem. Seasonal note: Hamburg uses daylight saving and Addis Ababa doesn't, so double-check the times in your own months — they can move by an hour.