The flight from New York (JFK) to Johannesburg (JNB) takes about 14h 18m nonstop on a widebody airliner, covering 7,973 miles (12,831 km).
Johannesburg is 6 hours ahead of New York. 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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