My supervisor has signed off on my research Chapters. I can't imagine he can have much of a problem with my Conclusion, given that it's a recap of the conclusions of the research Chapters.
He advised me that my Introduction was far too short and said I ought look at Introductions to past Theses in the group. One was 11 pages; one was 40 pages. Another was 18 pages. One, from a student in Leeds in Astrophysics, was around 56 (when you counted in the introductory equations section). Mine had stood at a concise 8, since the examiners who will be the primary readers of the thing will be largely uninterested in reading it for its own sake (though my supervisor points out the viva is an examination of whether I understand my research field). I have since extended it to a first draft style 17, in which there are references and vague aims in the text (Find out: How big is an accretion disc? On a more serious note, I have yet to find a good reference for the magnetic Prandtl number) which should comfortably expand when written out as complete sentences and paragraphs. I am aiming for a middle-of-the-road 30 pages.
My supervisor is away on holiday this week, so I have four days to expand that rough 17 into a smooth 30. He will presumably take at least a day to read it, in which time I can hit LaTeX with a hammer until it agrees to compile using *all* of my images, not just half of them. Then I will have another three days to iterate that process very quickly, aiming to hand in on the afternoon of Friday 2nd August.
It's doable. I certainly expect to have a 30 page Introduction ready for him when he comes back. The question mark really hangs on that fast iteration.