Amanda Warrington, 50, from Yate, Bristol, with her 24,000 piece jigsaw puzzle, that took her 17 months to complete. 16 January 2013. See SWNS story SWPUZZLE; When boxed the puzzle, released in March 2007, weighs an enormous 26 pounds â almost two stone. Life: The Great Challenge was officially recognised as the world’s largest puzzle by the Guinness Book of Records.