I'd definitely rather have it run long in first draft, and then have to cut it in second draft. But above that, it would be nice if it didn't run long at all, as that always feels like I've done extra work that I shouldn't have needed to do in the first place.

As it is, I'm sort of rewriting as I go. I've thought of changes in Part One that will necessitate differences in Part Three...meaning that I'll be writing a Part Three that won't quite fit with what I've already written for Part One.