The flight from Denver (DEN) to Narita (NRT) takes about 11h 24m nonstop on a widebody airliner, covering 5,774 miles (9,292 km).
Narita is 15 hours ahead of Denver. You cross 15 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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