Chicago is typically 14 hours behind Hong Kong. When it's 9:00 PM in Hong Kong, it's 7:00 AM in Chicago. Hong Kong does not observe daylight saving time, but Chicago does.
During US daylight saving time (March to November), the difference is 13 hours. During US standard time (November to March), the difference increases to 14 hours.
Optimal meeting window: 7:00 AM - 9:00 AM Chicago time (8:00 PM - 10:00 PM Hong Kong, or 9:00 PM - 11:00 PM in winter). Early morning Chicago catches evening Hong Kong.
Chicago's commodities trading at the CME Group requires coordination with Hong Kong's financial markets.