How long does it take to encrypt an Android device?

I decided to up my security game and encrypt my Android phone (Galaxy S4). Everything seems to have gone ok, but the encryption process is taking forever. I’ve been waiting at least 20 minutes, and I’m starting to worry that is has hung up. How long does device encryption take to complete on an Android device?

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Story added 25. September 2014, content source with full text you can find at link above.