The flight from London (LHR) to Hong Kong (HKG) takes about 10h 5m nonstop on a widebody airliner, covering 5,984 miles (9,630 km).
Hong Kong is 7 hours ahead of London. You cross 7 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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