Book size, that is. 
Does the length of a novel influence your decision to read it? Are you more or less likely to read a larger book?
What about the size of a series? If there are many books in a series, are you less likely to start reading it?
Does the length of a novel influence your decision to read it? Are you more or less likely to read a larger book?
What about the size of a series? If there are many books in a series, are you less likely to start reading it?