SF/F authors have a bit more freedom when it comes to book length but publishers are, nonetheless, keen to encourage their underpaid slaves (I mean writers) to get the word count down as much as possible. While this does of course result in tighter and often better writing, we all know it has more to do with cost concerns. I know some readers are intimidated by an excessively long book, but personally I want a story to last as long as possible. My own books come in around 170k to 200k words. So I am curious to hear your thoughts on book length. Have you ever found a novel to be too long? Have you ever refused a book simply on the basis of its size?