about 4 weeks or so
Long JumpIt is taking place in the Olympic Stadium.
It takes about 2 years to build a stadium
London has had a couple of Olympic Stadiums. One in 1908 and again in 1948. The current stadium has been under design and construction for the last 8 years since London learned they had won the bid for the 2012 Olympics.
Bayern Munich didn't own the olympic stadium. They played in it from 1972 to 2005, but they didn't own it.
The Olympic Stadium and Park began construction in 2007 to be ready for the 2012 Olympic Games. The finished Olympic Park, post games, will be completed by 2015 in time to host the 2015 European Hockey Championships.
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.