The flight from Narita (NRT) to Houston (IAH) takes about 11h 7m nonstop on a widebody airliner, covering 6,629 miles (10,669 km).
Houston is 14 hours behind Narita. You cross 14 time zones heading west. Westbound trips like this one are usually a little easier to adjust to, so plan for a day or two of jet lag.
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