At 11,924 miles (19,189 km), Johannesburg to Honolulu, Oahu is beyond the nonstop range of most airliners and is usually flown with a stop. Nonstop on a widebody it would take about 21h 13m.
Honolulu, Oahu is 12 hours behind Johannesburg. You cross 12 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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