The flight from Narita (NRT) to Johannesburg (JNB) takes about 15h 20m nonstop on a widebody airliner, covering 8,439 miles (13,582 km).
Johannesburg is 7 hours behind Narita. You cross 7 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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