The flight from Boston (BOS) to Narita (NRT) takes about 13h 10m nonstop on a widebody airliner, covering 6,686 miles (10,760 km).
Narita is 13 hours ahead of Boston. You cross 13 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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