Hamburg is 7 hours behind Hong Kong
Best overlap: 3:00 PM to 6:00 PM in Hong Kong is 8:00 AM to 11:00 AM in Hamburg.
Hong Kong and Hamburg overlap from 3:00 PM to 6:00 PM (Hong Kong) to the equivalent 8:00 AM to 11:00 AM in Hamburg — that's your meeting window. With about 3 hours of overlap, there's comfortable room for a daily stand-up — 3:00 PM in Hong Kong / 8:00 AM in Hamburg works well. Note the seasonal wrinkle: when Hamburg is on daylight saving and Hong Kong isn't, the gap between them grows or shrinks by an hour.