Why the idea of writing a novel in a month rubs me the wrong way

Why the idea of writing a novel in a month rubs me the wrong way:

“Fitzgerald wrote steadily through 1923, and had a first draft of [The Great Gatsby] finished by April 1924. … He was a professional writer from the start, and remorselessly put his work (even when constraints of writing to pay bills permitted him little time) through revision after revision.”

To quote Morrissey, “These things take time…”