The flight from Chicago (ORD) to Hong Kong (HKG) takes about 15h 17m nonstop on a widebody airliner, covering 7,781 miles (12,522 km).
Hong Kong is 13 hours ahead of Chicago. You cross 13 time zones heading east. Eastbound trips like this one tend to be harder to adjust to, so plan for a day or two of jet lag.
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