The one hour show is at 12, 3, 5 pm. Check here for a specific day and time. http://disneyland.disney.go.com/entertainment/disney-california-adventure/frozen-live-at-hyperion/
You can download an application called Disneyland (Google Play) and in it you will find the schedules of the characters and the places where the characters will appear, I used it in my visit to the park and I could find lots of characters, greetings and good luck
Check online?
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