I've been working on a paper from my PhD thesis. I have 10 pages of derivations before I even get to the solution of the equations, include figures, or perform

I've been working on a paper from my PhD thesis. I have 10 pages of derivations before I even get to the solution of the equations, include figures, or perform analysis. It could easily be a 30 to 40 page paper. Cutting it down or splitting it into 2 papers will likely be necessary because of page limits. You kind of need to pick and choose what to leave out. Of course, it happens without page limits as well. I used work from an older book and between two steps was easily two pages of work and there's another half dozen pages of work that from other parts of the derivation.