Interesting that you should ask: after I had the opportunity of doing
that for my girlfriend last weekend. It all depends on what texture the
long hair is. Her thick and glossy dark amber hair is just to her hips
and it weighed 14.5 oz (two inches in diameter at neck for ponytail).
Another model of a photographer friend (female) ...had ankle length
thick Irish red curly hair that went to her sock tops and she told me that it weighed 2lbs,13 oz.in coiled braid on the scale. This same model was an alpine climber and wore her hair inside of her clothes like underwear! Claimed that it worked just as well as any jumpsuit.
Next time you go and buy a pound of coffee beans to grind, weigh the
bag in your hand gingerly (all 16 oz's of it)...and then think of two bags of it (2 lbs of hair in a long ponytail) slung around your dick....
to do whatever you want with! Viva! Long Hair!!!