title: List of 30 Rock episodes
context: 30 Rock was a critical success, winning several major awards (including Primetime Emmy Awards for Outstanding Comedy Series in 2007, 2008, and 2009), and achieving the top ranking on many critics' year-end best of 2006 and 2007 lists.[1] On July 14, 2009, the series was nominated for 22 Primetime Emmy Awards, the most in a single year for a comedy series.[2] Despite the acclaim, the series struggled in the ratings throughout its run.[3] During the course of the series, 138 episodes aired over seven seasons.
question: How many episodes of 30 Rock were there?
answers: 138