The flight from Johannesburg (JNB) to Seoul (ICN) takes about 13h 51m nonstop on a widebody airliner, covering 7,717 miles (12,420 km).
Seoul is 7 hours ahead of Johannesburg. 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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