Perhaps not surprisingly, the length of Howard Hughes' fingernails at his death is of some dispute.
From Time Magazine (http://www.time.com/time/magazine/article/0,9171,918526-2,00.html) - "His fingernails were two inches long, and his toenails grew and grew until they resembled yellow corkscrews." Entertainment Weekly, on the other hand, claims that he had "foot long fingernails." (http://www.ew.com/ew/article/0,,190166,00.html)
I suppose we really don't care.