Hong Kong is 7 hours ahead of Geneva
Best overlap: 8:00 AM to 11:00 AM in Geneva is 3:00 PM to 6:00 PM in Hong Kong.
Your shared working hours run 8:00 AM to 11:00 AM in Geneva (3:00 PM to 6:00 PM in Hong Kong). You get roughly 3 hours of shared time, so aim for the middle of that window to keep the call comfortable for both teams. Heads up: because Geneva changes its clocks and Hong Kong doesn't, the difference moves by an hour twice a year. Confirm the overlap around the DST switch.