Oh, I see what you mean. Don't worry, I'm definitely gonna finish this fic! Probably not before I go back to school in late September, but I can try!
I'm not much of a pre-planner. I tend to start out with a basic premise and a vague idea of what kind of ending I want. This fic is easier than most because it's a crossover (sort of), so a lot of the plot kind of writes itself by combining the original story with the Scientology stuff.
Admittedly, part of the fic is just me kind of blowing off steam with some of my issues about the way the plot of the manga is progressing... I'm trying to reserve judgment until vol 16 comes out in English (I know what happens in it because I have a friend who reads Japanese, but not word-for-word), but a large part of the inspiration in this and the next chapter is just me saying, "This is the way Excel SHOULD have met Umi."
Boy, if I had to estimate... ten chapters, maybe? Watch me go back on that.