This book was an interesting read, though I cannot say that I understood everything. In fact, I did not understand much. It was still interesting. As most say, the benefit of reading Heidegger lies in the possibilities his work opens, and it is this capacity of having possibilities presented to you that interests me in the History of the Concept of Time.
With Heidegger I have the impression that he does not aim at giving you answers. If a book is entitled the History of the Concept of Time do not expect it to be about time itself. It will not speak of time at all, or it will wait until the end to give you an approximate understanding of what you seek. History of the Concept of Time is about time, but you only realize that at the last page of the book, that’s when you can relate everything you read to each other and to time, if you were able to read the whole book, that is.
If the last page of the History introduce you to time, this means that the whole book, or what you read of it, shows you problems related to times and possibilities whose aim is to help you find answers for yourself, if such aim is possible at all.