Miami is 12 hours behind Hong Kong

There is no standard 8-to-6 overlap. Someone joins early or late.

The 12-hour offset between Hong Kong and Miami means there's no point hunting for a 9-to-5 overlap — there isn't one. Expect compromise: someone in Hong Kong or Miami will need to take the call outside the usual 9-to-5, so share that load. Remember that Miami shifts for daylight saving and Hong Kong doesn't, so recalculate the overlap after each clock change.