Los Angeles - London - Otopeni, with British Airways: min 14 h 40 min (12 300 km, straight line)
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A long time
It would take about 13 hours to fly from Los Angeles to Rome Italy.
It will take about 1 hour.
If you are asking about the Cornwall in England, then you can't drive from there to Los Angeles, because of the ocean.
A drive from Las Vegas to Los Angeles would take about 70 hours.
how long does it take for mail from Los Angeles to get to Stockton CA
Los Angeles - London - Otopeni, with British Airways: min 14 h 40 min
about 9 hours
few days
15 hours
19 hours
30 hours