The flight from Dublin (DUB) to Narita (NRT) takes about 10h 1m nonstop on a widebody airliner, covering 5,959 miles (9,589 km).
Narita is 8 hours ahead of Dublin. 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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