Hong Kong is 15 hours ahead of San Diego
Best overlap: 5:00 PM to 6:00 PM in San Diego is 8:00 AM to 9:00 AM in Hong Kong.
Keep meetings inside 5:00 PM to 6:00 PM in San Diego — that maps to 8:00 AM to 9:00 AM in Hong Kong. With overlap this short — around 1 hour — a recurring slot at 5:00 PM in San Diego (8:00 AM in Hong Kong) is worth its weight in gold. One thing to flag — this overlap crosses the date line, so Hong Kong is on the next day relative to San Diego. Remember that San Diego shifts for daylight saving and Hong Kong doesn't, so recalculate the overlap after each clock change.