Penguin Classics Collection

Penguin Classics Collection names 56 books, every one listed here. The most approachable of them is Of Mice and Men by John Steinbeck (difficulty 34/100, about 1.7 hours); the hardest is Ulysses by James Joyce (89/100).

Questions

How many books are on Penguin Classics Collection?
56, all of them listed here with how hard each is to read and how long it takes.
Which book on Penguin Classics Collection is the easiest to read?
Of Mice and Men by John Steinbeck, difficulty 34/100, about 1.7 hours. The hardest is Ulysses by James Joyce, at 89/100.
How long would it take to read every book on Penguin Classics Collection?
About 535 hours for the 56 books ReadingRate measures, at 250 words a minute adjusted for each book's difficulty: 267 days at two hours a day.

Other lists: Penguin Modern Classics, NYRB Classics, Everyman's Library, Library of America, Biblioteca Ayacucho, Bibliothèque de la Pléiade, Heinemann African Writers Series, Oxford World's Classics, UNESCO Collection of Representative Works. All lists.