Check out this conversation between Stephen King and George R.R. Martin. You should watch the whole video but if you don’t have the time, the highlight is around 50:27 in which you hear Martin ask the one question he’s always wanted to ask King.
The interview came from an event in Albuquerque, New Mexico. Martin demanded to know how King writes “so many books, so fast”.
While Martin takes his time, King tries to “get six pages a day everyday” when he’s working. It’s all about setting writing goals daily to complete a larger project. King also brought up J.K. Rowling’s experience on being pressured to finish the seventh Harry Potter book while being at an event in New York and having vacation with her kids.