Not including short story collections, poetry collections, anthologies, etc.
For me, I believe it’s Oroonoko by Aphra Behn because it was on the syllabus for three different classes that I took in college. Other than that, the most I’ve read a single book is twice, and that was Telegraph Avenue by Michael Chabon. I’ve read Dracula 1.5 times. Didn’t finish it the second time around.
I LOVED A Tree Grows in Brooklyn. It was my reading groups book and without it I would have probably never even heard of it. Love it so much I’ve lent it to a few people and excited to reread it in a few years 🫶