That is a classic review.
And to answer the rhetorical question: never enough.
When I went to university I packed up most of my books and put them in my parents basement and, of course, there was a flood that destroyed about 1,000 of them. My parents didn't even tell me as they knew I would be so upset. The set I miss the most was the World War 2 series by Time-Life. 39 volumes of over 200 pages each. There is no way a high school kid needs to know that much about WW2 either. But whatever!