Longest fingernails on a pair of hands ever (female): 1,306.58 cm (42 ft 10.4 in) by Diana Armstrong 🇺🇸 As seen in the Guinness World Records 2023 book, Diana from Minnesota, USA has been growing her fingernails for over 25 years. Her right thumbnail is the longest of all her nails, measuring 138.94 cm (4 ft 6.7 in). By comparison, her shortest nail (her left pinky fingernail) is 109.2 cm (3 ft 7 in) long.