Santiago is 6 hours behind Addis Ababa
Best overlap: 2:00 PM to 6:00 PM in Addis Ababa is 8:00 AM to 12:00 PM in Santiago.
Plan around 2:00 PM to 6:00 PM in Addis Ababa, which is 8:00 AM to 12:00 PM in Santiago, to catch everyone during office hours. A 4-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. For part of the year the maths changes: Santiago observes daylight saving, Addis Ababa does not, shifting the overlap by an hour.