The flight from Las Vegas (LAS) to Beijing (PEK) takes about 12h 17m nonstop on a widebody airliner, covering 6,233 miles (10,031 km).
Beijing is 15 hours ahead of Las Vegas. 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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