In the US there's actually an FCC requirement that television channels air news.
From https://www.fcc.gov/media/radio/public-and-broadcasting: "virtually every station has an obligation to provide news, public affairs, and other programming that specifically treats the important issues facing its community." The details are specific to the license, but almost every station is required to air at least an hour of news a day.
It's unclear, because the exact details are specific to the license and therefore may vary from station to station. My local television stations usually air the news at 11, which is after primetime.
From https://www.fcc.gov/media/radio/public-and-broadcasting: "virtually every station has an obligation to provide news, public affairs, and other programming that specifically treats the important issues facing its community." The details are specific to the license, but almost every station is required to air at least an hour of news a day.
There's also requirements to air a certain number of hours of educational material for children (https://www.fcc.gov/consumers/guides/childrens-educational-t...).