The amount of time between the same story on consecutive airings of SportsCenter on ESPN. When a person realizes it has been one sportshour, they also realize that they are completely wasting their time.
A sportshour is equivalent in length to one hour.
Guy1: Yo dude didn't they already show highlights from the Knicks-Bulls game?
Guy2: Yeah cus it's been one sportshour, lets go do something else.