Long Hair to me is anything that either reaches the nipples or with curly hair would do if the hair has straight. As I've mentioned before, I prefer blondes long and straight and redheads or brunettes with at least a degree of waviness, if not curly. No idea why these preferences!
Also I like thickish short to mid-length hair (e.g. southerncharms3.com/isabel/index.html) but would not normally post here.