Ayanna Williams of Houston was growing her nails for 28 years. They were 18 ft. long (total) in 2017 when she was handed a Guinness World Record back in 2017 for the longest fingernails on a pair of hands, but grew out to 24 ft. Ayanna said it took four bottles of nail polish to cover all of her nails. A doctor used an electric rotary tool to cut them off.