The flight from Hong Kong (HKG) to Philadelphia (PHL) takes about 13h 32m nonstop on a widebody airliner, covering 8,100 miles (13,036 km).
Philadelphia is 12 hours behind Hong Kong. You cross 12 time zones heading west. Westbound trips like this one are usually a little easier to adjust to, so plan for a day or two of jet lag.
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