Something I'm just accustomed to when I see long hair is when I see it longer the next time around. I'm always astounded they have grown it longer than before(the guy who posted in Big Hair a couple of days back had the right idea).
I always remember back to the days of the French based page MLHP where they had a clip of a girl who had an elapsed film of her growing out her shoulder-length hair in three years to bsl... can't tell you how many times I spent "transfixed" on that single AVI...