User blog comment:BlouseGirl/Funny facts about Frozen/@comment-61573-20140808102453/@comment-27934123-20140808104831

Actually, yes. I believe CP (computer generated) hairs quite fascinating. However, I've acknowledged that Rapunzel hasn't tied her hair up, or styled it in any way. I suppose straight hair takes up less time animating, but a slightly messy side braid with little details (Elsa's one even has small snowflakes on it as well) definitely blew me away. Also, if you look closely in one of the final scenes - Elsa was about to flee from Arendelle after she escaped from the prison cell - yeah, you can see her hair violently blowing in the wind, with the little details and all.

Ultimately, I guess Rapunzel has less hairs to work with, but somehow, the Tangled creation (and a 3D-CG kind of movie Disney hasn't done in a long time) took around 7~12 years to make. For Frozen, it only took up to 3.