Houston is 13 hours behind Hong Kong
There is no standard 8-to-6 overlap. Someone joins early or late.
For Hong Kong and Houston, the standard workday in one city falls outside office hours in the other — that's what 13 hours of distance does. Keep live syncs short and infrequent, and let written updates carry the day-to-day between Hong Kong and Houston. The window above shifts seasonally: Houston keeps daylight saving while Hong Kong ignores it.