Do you believe this? What does it mean? Are you a disciplined writer? If you’re writing every day then yes you are discipline – forget how long. It doesn’t matter how long you write. Unless you have a deadline, the time you write in a session is less important than the number of sessions you rack up.
If you don’t like the word “disciplined” how about consistent? It’s the same thing. Because you will become a consistent writer if you write every day. Not only that, your brain will get used to the idea that it has to come up with ideas on a consistent basis. It will become easier for you to find your creative path. Creativity will become the norm. Isn’t that what you’ve always wanted?