The flight from London (LGW) to Narita (NRT) takes about 10h 3m nonstop on a widebody airliner, covering 5,973 miles (9,612 km).
Narita is 8 hours ahead of London. You cross 8 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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