I’ve read Cloud Atlas, it’s still readable as long as you can remember where the story stop. Currently I’m reading The Silmarillion and Moby Dick concurrently and I think they are still bearable. For Silmarillion, at least I should have internet to check who is in the story. But, a difficult book that I read now is The Luminaries by Eleanor Catton. Lots of character, telling instead of showing kind of writing, mouthful style of prose within 800++ pages. I don’t know whether I can finish it.