The flight from Chicago (ORD) to Narita (NRT) takes about 12h 20m nonstop on a widebody airliner, covering 6,259 miles (10,073 km).
Narita is 14 hours ahead of Chicago. You cross 14 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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