Worth noting that Hopkins rereads his scripts because he is acting on them, in both the specific and general sense of "act," and not necessarily for the casual reader's pleasure. I wouldn't be surprised to learn that a professional musician plays a piece > 100x before he performs it on stage, or that a translator ends up reading the source material > 100x before she translates it.
I do agree that rereading a book you enjoyed is valuable, but if you're not a professional "actor" on the artwork, or you didn't passionately love the book, I think it's preferable to wait between rereads, longer than would make possible 100 rereads in a human lifetime. You're a different person than you were 5, 10, 20 years ago, and you'll experience the same book differently as a different reader.
I do agree that rereading a book you enjoyed is valuable, but if you're not a professional "actor" on the artwork, or you didn't passionately love the book, I think it's preferable to wait between rereads, longer than would make possible 100 rereads in a human lifetime. You're a different person than you were 5, 10, 20 years ago, and you'll experience the same book differently as a different reader.