Via Wikipedia:

King’s formula for learning to write well is: “Read and write four to six hours a day. If you cannot find the time for that, you can’t expect to become a good writer.” He sets out each day with a quota of 2000 words and will not stop writing until it is met. He also has a simple definition for talent in writing: “If you wrote something for which someone sent you a check, if you cashed the check and it didn’t bounce, and if you then paid the light bill with the money, I consider you talented.