The flight from Hong Kong (HKG) to Johannesburg (JNB) takes about 12h 5m nonstop on a widebody airliner, covering 6,633 miles (10,675 km).
Johannesburg is 6 hours behind Hong Kong. You cross 6 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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