Swindon to Willesdon, London is approximately 80 miles.  By car, the trip would take approximately 1 hour and 43 minutes.  

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Christopher's trip to Willesden is close to the same amount of time.  His train ride from Swindon is approximately 54 minutes.  Once he arrives in London Paddington Railway Station, he would take the tube to Willesden Junction, which would be approximately a 17-minute ride.