(Quoting-from-articles-I-wrote-and-also-from-interviews-with-two-writers-whose-work-I-admire catch-up post, four of five.)
From a brief, undated (as far as I can tell) interview:
The Short Review: How long did it take you to write all the stories in your collection?
J. Robert Lennon: About a year, all told. […]
The Short Review: Did you have a collection in mind when you were writing them?
J. Robert Lennon: Not at first—I was just killing time while my son was taking naps. But after 20 or so I decided that I was actually writing a book, and began to take the project more seriously.