Yeah this, I don't even know. I re-read books all the time. I started reading 300+ page novels in 3rd grade and haven't really stopped since. (HARRY POTTER COUNTS!!!!)
But seriously, if I had to make a rough guess, upwards of 200 with re-reads, and generally these are novels, not short stories, fuck short stories.
My favorite book is over 1000 pages, Shogun by James Clavell. Read it. You won't be disappointed.