The flight from Narita (NRT) to Las Vegas (LAS) takes about 9h 16m nonstop on a widebody airliner, covering 5,500 miles (8,851 km).
Las Vegas is 16 hours behind Narita. You cross 16 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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