For the London Olympiad, the land preparation for the stadium began in mid-2007, (with the official construction start date on 22 May 2008) and construction took four years (to 2011) to complete.
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No more than 6 years and 9 months. 6 years and 9 months is the time apart from the announcment of the host city and the acutual ceremony. It might be long short than that but that is a base number and is somewhat close to 6 years and 9 months.