The Challenge

I have decided to give myself a challenge.  I am going to see how many days I can go (I can barely say this.) without buying a book.  I realize I have been buying too many books.  I have been buying books on a whim.  That is not the way I should handle my reading.  I like to research and pick books that I know about.  When I go in the store all Willy Nilly, I get overcome with my passion.  The clearance books always call my name.  Once in awhile I find a good clearance book.  It is just not what I should be doing on a regular basis. 
I am on Day 2.  Let me hear some guesses from you people.  How many days do you think I can go?  Put a challenge out there for me.