The flight from London (LGW) to Sepang (KUL) takes about 11h 21m nonstop on a widebody airliner, covering 6,583 miles (10,594 km).
Sepang is 7 hours ahead of London. You cross 7 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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