The flight from Houston (IAH) to Narita (NRT) takes about 13h 3m nonstop on a widebody airliner, covering 6,629 miles (10,669 km).
Narita is 14 hours ahead of Houston. 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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