The flight from Johannesburg (JNB) to Sydney (Mascot) (SYD) takes about 11h 29m nonstop on a widebody airliner, covering 6,850 miles (11,024 km).
Sydney (Mascot) is 8 hours ahead of Johannesburg. You cross 8 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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