It's not possible to reduce twenty years of diary keeping to a number, but here's one: 800,000. That's the amount of words that Sarah Manguso had written in over twenty years of keeping a daily diary. In her new memoir, "Ongoingness," she talks how something often considered so virtuous actually became a vice. In this interview—interspersed with readings from her memoir—she talks about the relationships between the act of writing, the passage of time, and the ability to live a full life.