Assuming that the 62,613 posts as of this writing averaged to ten words each, we'd have 626,130 words. As someone with a degree in creative writing, I generally manage to get around 8,500 words into 25 double-spaced pages, or 12.5 single-spaced pages, using Word with one-inch margins all around. There are ~73.66 units of 8,500 words to be found in 626,130 words. So, multiplying it out, the book would be roughly 920.78 single-spaced pages--in Word. Most paperback books won't fit nearly as many words on a single page as Word will; the double-spaced comparison is probably closer to being fully appropriate. So basically we might estimate that it would be about 1841.56 pages.
Again, all founded on the assumption that the posts averaged ten words in length. >_> I'm inclined to think that's a low estimate, but maybe that's because my own posts are fairly wordy. <_<
