Though I can appreciate this quote for the process of writing, I am not so much a writer as I am a visual artist and a sewer. I can see how this process works for me with sewing, quilting, painting, and even gardening and house projects. I am satisfied by the incremental, the slow and steady of what I am able to contribute and create in short periods of time. While some days may result in more than a paragraph (or the equivalent), most days do not lend themselves to whole books (or quilts, or finished works).
What do you do step by step, as you have little bits of time?