How long does it take to write a book? The recent interview with Danielle Steele should cast some light--a year on a 80+ page outline, a year on the first draft, two years on revision of that draft. How do you stack up? Have you ever done an 80+ page outline?
In Hollywood, they do what are called treatments, which can vary by length, but most professional writers do create long treatments of their stories, sometimes working on that treatment for more than a year. Why all this work? To create the kind of stories that people want to see on the screen or read. Writing is hard work. Very hard. It takes commitment, discipline, effort, and talent. You can't be depressed or distracted. You have to be smart, alive, plugged in, part of something. You have to be an astute observer of life and people.