These are the two thoughts that come to mind, and that I would like to throw out to the floor.

1) What is the artistic equivalent of 20,000 words?

2) I have the sense that many writers -- not all, of course -- would have difficulty writing a very long story to a prompt. Am I right about this? How does compare to creating art to prompts, which I freely admit to knowing nothing about? ;)

edited for stupid wording error