I read the all the books from Percy Jackson & the Olympians, the Heroes of Olympus up to the House of Hades
I have read the Last Olympian more than 5 times, the Battle of the Labyrinth 3 times, the Titans Curse 4 times, the Sea of Monsters 4 times, the Lightning Thief 3 times, the Lost hero 1 time, the Son of Neptune 3 times, the Mark of Athena 7 times and the House of Hades 3 times. The Demigod Files 2 times.
! I've read all of Rick Riordan's books, however I'm currently reading (for the 50th time) the Artemis Fowl series.