This book is for our own time. The book is about the time which we feel. After reading the book no one will waste time. Time is made up by thinking and that helps us. The reader must read the book carefully to find the difference between the physical time and thinking time. I have read books on real time and I mention it as physical time, but the actual time is that which we think about. I am thankful to the publisher who published my paper on time and we. Now I decide to publish a book on it because the actual time is not that which we see. The time is essential for artificial intelligence because the person or the machine which can think faster than the given time is more intelligent than other. So this book is helpful for AI also. I am thankful to my father Sri Basudeb Jana and mother Late Mira Jana for their support and effort for coming out from my bad days. I am proud of my father, mother and brother.