I've heard of some guys who have to use nail-varnish to reinforce weak nails. I don't know, if that were me, I think I'd take up Piano :-)
I usually try to keep my nails in the range that allows the nail to contact the string, but not so long that it's all nail and no fingertip (which makes a harsher sound, more like a harpsichord pick, if you know what I mean).
Besides, if they get too long you end up breaking them and looking like even more of a sissy when you say "DAMN! I broke a NAIL!! :-)
-Markus
"I think there is a world market for maybe five computers."
(Thomas Watson, chairman of IBM, 1943)
(Thomas Watson, chairman of IBM, 1943)