I have a choir recital coming up on the 19th, and my mom wants me to set her up with one of my (many) cameras to record it with. My two point-and-shoots don't have good sound quality, and she wouldn't understand my DSLR in a million years. Therefore, I'm considering letting her use my iPhone 5. The recital is expected to run 30-45 minutes. On a full battery, would this be doable? Also, approximately how big of a file would this be? I have the 16GB version and I am cleaning it out today, so I'll have probably 10+ GB leftover.