The flight from Barcelona (BCN) to Hong Kong (HKG) takes about 10h 31m nonstop on a widebody airliner, covering 6,250 miles (10,058 km).
Hong Kong is 6 hours ahead of Barcelona. You cross 6 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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