Hamburg is 6 hours behind Ho Chi Minh City
Best overlap: 2:00 PM to 6:00 PM in Ho Chi Minh City is 8:00 AM to 12:00 PM in Hamburg.
Book within 2:00 PM to 6:00 PM Ho Chi Minh City time (8:00 AM to 12:00 PM in Hamburg) and both teams will be at work. Hamburg is 6 hours behind Ho Chi Minh City, so you've got a workable 4-hour overlap — ideal for a standing meeting around 2:00 PM in Ho Chi Minh City (8:00 AM in Hamburg). Note that Hamburg follows daylight saving while Ho Chi Minh City stays put, so the times above drift by an hour seasonally.