There is no single answer to this question, of course. It varies depending on your current and hoped for lifestyle.  An investment adviser named Bill Landberg sent me a book on the subject that’s worth a look. It’s called “The Number” and it’s written by Lee Eisenberg. It doesn’t tell you the answer, but it helps you to start thinking about your own Number. In future blogs, we’ll discuss some tools that you can use to do your own calculations.