Are long fingers good for guitar?
Long fingers might help for extended chords low on the fretboard, but I find mine almost too long for the guitar, better suited for bass. Fatter fingers may hinder a player a little but, as long as the fingers are well practiced and therefore nimble/dexterous/efficient etc, they should have no problems.
How long should fingernails be for guitar?
The nails should be long enough to easily pluck the guitar strings. Standard Guitar Nail Length: For a standard nail length, grow the index, middle and ring fingernails until they extend slightly past the fingertips--just 2 - 3 millimeters.