At the end of the press release for Bloomsbury's UK CD/cassette audio book editions of the latest Harry Potter book, after they mention the running time listed as being 21 hours in total, they list some things you could do in that time.
"In 21 hours you could:
...
'Listen to Queen's 'It's a kind of magic' 290 times'"
ED: You'd think someone from Queenzone is working with Bloomsbury UK, eh?
http://www.bloomsbury.com/harrypotter/news/