A heck of an interesting book when you can grasp the concepts, and a more difficult read when you can't. The author makes an admirable effort at explaining the notion of "time," which most people would merely admit "passes." It's soooo not that straightforward!
The author admirably attempts to explain time's notions across the span of quantum and relative space, concepts hard to explain or grasp. And don't even get started on "dimensions." Even physicists can't get a handle on a lot of the theories from this book.
The book is originally written in French, therefore big kudos to translator Glenn Burney for what had to be a demanding translation, given the puzzling and elusive nature of the subject matter and difficulty in presenting it in any language.