I've read Howl's Moving Castle probably 7 or 8 times, I haven't kept track.

I used to reread Harry Potter a lot, maybe 3 or 4 times, but I don't like them anymore as an adult (which is a completely separate thing from me not liking JKR btw... the nostalgia just isn't enough to overcome my issues with how the books are written anymore).

The LOTR trilogy on the other hand, has only gotten better for me as an adult and I think I've read those 3 times? I just started reading Fellowship for the 4th time yesterday.

There are some books I read when I was younger that I've reread once as an adult: Things Fall Apart, The Things We Carried, a few of Shakespeare's plays... after a decade+ I just forget them and I want to experience them again.