The flight from Johannesburg (JNB) to Bangkok (BKK) takes about 10h 5m nonstop on a widebody airliner, covering 5,590 miles (8,996 km).
Bangkok is 5 hours ahead of Johannesburg. You cross 5 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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