At 11,491 miles (18,493 km), São Paulo to Narita is beyond the nonstop range of most airliners and is usually flown with a stop. Nonstop on a widebody it would take about 20h 48m.
Narita is 12 hours ahead of São Paulo. You cross 12 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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