Q: taking a long time to download

Hey Rebecca 94!

You may need to check for sources of Wi-Fi interference if you are on a wireless connection:

Wi-Fi and Bluetooth: Potential sources of wireless interference

http://support.apple.com/kb/ht1365

We also have another article that may help you make further sense of the situation:

iTunes Store: Download times will vary

http://support.apple.com/kb/ht1577

Take care, and thanks for visiting the Apple Support Communities.

-Braden