@SandraMJ - I have an outline for Grassblades, covering everything from beginning to end. It is, however, more than a little vague at certain points, which allows me to flip and change things around if I need to, add bits I want, and subtracts the bits I don't need. I'm estimating 25 pages per point in the outline as an average, as some of them will be a lot shorter, others will be a lot longer. But since I don't have a set chapter-length, or any solid idea of how much space everything is going to take up, my estimate differs 250 pages from lowest to highest point.
I do have unlimited ideas for all of them (if I had a time-turner, I'd be drawing Grassblades forever!), but I'm only drawing the ones relevant to the story.