Hamburg is 4 hours ahead of Santiago
Best overlap: 8:00 AM to 2:00 PM in Santiago is 12:00 PM to 6:00 PM in Hamburg.
Santiago and Hamburg overlap from 8:00 AM to 2:00 PM (Santiago) to the equivalent 12:00 PM to 6:00 PM in Hamburg — that's your meeting window. 6 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved.