In an interview with "Fresh Air" host Terry Gross last September, timed to coincide with the publication of her book, "Not That Kind of Girl," Lena Dunham offered a surprising insight into the sense of stasis that has plagued "Girls" since I reviewed it, rather lovingly, at the end of season one: "[T]he span of time that we've covered [in] the show is much shorter than the span of time in which I've been doing the show.