Brian Steinberg Senior TV Editor You’ll need more than an hour a week this season to really experience “60 Minutes.” The venerable CBS newsmagazine, entering its 57th season, will move firmly beyond its Sunday-evening model with the launch of a free ad-supported streaming channel devoted to its library of investigations, features and profiles — including Andy Rooney’s essays and Mike Wallace’s reports. CBS News is also debuting “60 Minutes: A Second Look,” a 12-episode audio series hosted by CBS News correspondent Seth Doane that gives listeners access to a vault of stories, along with never-before-aired material and interviews with the producers and correspondents who reported and assembled the material. The streaming channel is available Thursday on Paramount+, Pluto and CBS News digital venues while the audio show begins September 17.