We just saw Frozen for the first time today. For the 3:30 showing we got there at about 2:25 or 2:30 and they let us in about 3:10.
DD who is 8 and loves Frozen still but refuses to admit that to anyone loved the show. She was wide eyed and very attentive to the show the whole time (it's an hour long). I thought it was very good. I would watch it again on another trip but I don't think it has the staying power that Aladdin had.