Christine ‘The Duchess' Walton has set a new record for having the world's longest fingernails and she is entered into the 2012 Guinness World Record book, winning, for the Las Vegas resident, the top spot for human fingernail growth. In total, her nails measure a whopping 19ft, 9in long. The nails on her right hand are 9ft, 7in and her left hand boasts fingernails measuring 10ft, 2in. Christine has been growing her nails for 18 years and the effort and inconvenience have finally paid off.