Unless, of course, that the 'Stratford' you refer is is actually Stratford upon Avon, a MAJOR tourist destination / location in the UK, rather than a smallish London suberb?
If this IS the case, travel time (by road) will vary according to the route you choose: the location is just over 100 miles North-west of London and can be access via several different routes / main roads. Typically, from experience the journey in a car will take a couple ours, plus or minus 15 minutes.
About 2 hours - see the related link below.
It Takes 2 hours from Southall but 4 hours from Stratford/Leyton/Leytonstone
Stratford, London, 2012
Stratford - on - Avon or Stratford London E15
Stratford-on-Avon is located in Warwickshire County in central England.
London Marylebone to Stratford-upon-Avon takes approximately 2 hours on the direct service (no stops). If you take the slower service which goes via Birmingham, the journey is 2 hours 30 minutes because you need to get from New Street station to Moor street station.
The distance between London Victoria and London Stratford is approximately 6 miles.
Stratford
To get to Westfield Stratford, you can take the London Underground to Stratford station, which is served by the Central and Jubilee lines. If you're traveling by train, you can also catch a Greater Anglia or London Overground service to Stratford. From the station, it's a short walk to the shopping center. Alternatively, several bus routes serve the area, providing additional access options.
The London 2012 Olympic Games are held in the Olympic Stadium.
It is about 63km from London, Ontario to Stratford, Ontario. Driving time is about 1 hour, 5 minutes.
The London 2012 games will be in Stratford.