Conan is changing its format. A year after signing a new four-year deal with TBS, the Turner-owned cable network announced Thursday that it will reduce Conan O'Brien's little-watched late-night series from an hour a night to a half-hour a night come 2019. Additionally, TBS is expanding its partnership with O'Brien's Team Coco and has unveiled plans to expand its touring and online efforts connected to the long-running late-night series.