Hong Kong is 7 hours ahead of Hamburg
Best overlap: 8:00 AM to 11:00 AM in Hamburg is 3:00 PM to 6:00 PM in Hong Kong.
Hamburg and Hong Kong overlap from 8:00 AM to 11:00 AM (Hamburg) to the equivalent 3:00 PM to 6:00 PM in Hong Kong — that's your meeting window. Hong Kong is 7 hours ahead of Hamburg, leaving about 3 hours of shared hours — plan recurring calls early in that window to leave buffer. 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.