User blog comment:J Fan/2012 Anniversary of June 14, 2010/@comment-4967581-20120614181912/@comment-1984959-20120614184411

They were working on the movie for at least a year, from pre-production(location scouts, making the QAR, etc), to post-production(putting the clips together, special effects, etc). But filming for the movie took about 5-6 months...if you count JB's twitter. If I remember correctly, filming went from June 14 - November 19, 2010.