The flight from Toronto (YYZ) to Narita (NRT) takes about 12h 36m nonstop on a widebody airliner, covering 6,400 miles (10,299 km).
Narita is 13 hours ahead of Toronto. You cross 13 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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