As part of my research for An Anthology of Authors Atrocity Stories About Publishers, I conducted a study (employing my usual controls) that showed the average shelf life of a trade book to be somewhere between milk and yoghurt.
ATTRIBUTION:
Calvin Trillin (b. 1940), U.S. humorist. Uncivil Liberties, first published in The Nation (June 24, 1978), Ticknor & Fields (1982).