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This really is one of those legends that seems to have suffered a whisper-down-the-lane effect. Wikipedia claims it weighs in at 28 pages, on Princeton's website it is 32. Some forum contributor on degreeinfo.com claims it was only 23 pages long.
In any case, it was short, sweet, and revolutionary.
I really respect that. I've slogged through CS dissertations that were approaching 250 pages in length. By the middle you start pulling your hair out and wishing they had the brevity of John Nash.
My dissertation will not be 23 pages long. Why, the table of contents alone is pushing 30! (Just kidding!) (mostly).