Every agent or publisher will throw out a different number to such questions, and usually that number is made up. What’s even more frustrating: building a platform only to land a book deal usually ends up short circuiting. (Here’s why.)
Here's a brief summary on what you should focus on how to approach your author's platform. Regardless if you're just starting or have been working on yours for some time, this article will show you what you should really focus on.