The flight from Johannesburg (JNB) to Houston (IAH) takes about 16h 23m nonstop on a widebody airliner, covering 9,021 miles (14,518 km).
Houston is 7 hours behind Johannesburg. 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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