 How long did it take for damaging criticism of the book to come out?
The people who had galley proofs were handpicked by Murray and his publisher. The result was what you'd expect: The first wave of publicity was either credulous or angry, but short on evidence, because nobody had had time to digest and evaluate the book carefully. Most works containing fresh regression analysis and historical argument from primary sources would be published in academic quarterlies that send manuscripts out for elaborate, lengthy evaluation before deciding whether to publish them. The debate on publication day was conducted in the mass media by people with no independent ability to assess the book. It wasn't until late 1995 that the most damaging criticism of The Bell Curve began to appear, in tiny academic journals.
 A full year
 There has never been criticism leveled at the book.  Five years  Six months  A full year