I've actually thought in it. Full blown novel series. About 5 to 7 novels of roughly 80000-100000 words (give or take, around 300 pages per book). IMO, if I do less I will have to make things too cramped and rushed, sacrificing detail. If I do more, well, it may drag things out too much. If something's "short" it's better. Anyways, this is subject to change, because I only fully outlined the first three.