54 days.

By the way, if you haven't read Fifty Shades of Grey by E L James, you might want to try it.  I put it on my wish list at Amazon before I knew anything about it other than it sounded good; that day, someone anonymously gifted the Kindle edition to me.  O.M.F.G.  Hot doesn't describe it.

It turns out that it was originally Twilight fanfiction called Master of the Universe.  It had a huge following and was picked up for publishing.  Of course, all references to Twilight, including the names/characters Bella and Edward had to be expunged.  Now they're Ana and Christian, and it's quite a story.  I didn't buy it myself because it costs $10 and I just can't spend that much on one book on my tight budget.  However, before I finished reading this one, I went ahead and bought Fifty Shades Darker.  Yep, I paid $10 for it.  I'd say it's well worth every penny, even though I haven't started reading it yet :)  I loaned the first one to a friend already; unfortunately, Kindle allows a book to be loaned only once.