OK, here are some stats for the first Legends book.
The final narrative-text-page count ended up at 552, versus 675 numbered pages. That means 123 pages (18.22%) are either blank space or epigraph text.
There are 126 "narrative units" (1 prologue + 125 "chapters").
The minimum length is 1.75 pages.
The maximum length is 8.5 pages. This gives a range of 6.75 pp.
The average length is 4.381 pp, but the median (which separates the data into two halves) is even lower at 4.125 pp. (Because there is an even number of data points, the median is the average of the two central values, which happen to be 4.0 and 4.25 pp.)
The mode is 3.75 pp, 15 chapters (11.90%) being of that length.
Here is the distribution for the number of chapters with a given page length:
(Click pic for larger version)
The 63 chapters less than the median length somewhat unexpectedly account for only 202.25 pp (36.64%) of the book, with the remaining 349.75 pp (63.36%) made up by the other half. That should not, however, be taken as countering the general impression that the McDune books are composed of short chapters, because even in this book HALF of the chapters are less than half the length of the longest single chapter.
What's was really interesting to me is that only 65 of the 126 chapters (or 51.59%) are composed of a single, unbroken block of text. Of the remaining 61 chapters (48.41%), 40 (31.75%) are divided into 2 sections, 12 (9.52%) have 3 sections, and 9 (7.14%) are divided into four sections. Arranged in order by number of sections and number of pages, they look like this:
Note the number of pages less than 4 pages in length that are divided into more than one section. The two 3.5-pp chapters divided into 4 sections are particularly obnoxious.
I'll post similar stats for the other two Legends, and eventually all the other McDunes, as soon as I work them up. (A comparison with the originals would probably be in order, too.)