C’mon, it’s a TV show. They all go to work all day in the show. But it would be pretty boring to watch them working at a desk for a half hour.
One of the funnier episodes was when Raj went to work for Sheldon rather than be deported. They stared at an equation for nearly half the show while the background music was "Eye of the Tiger." Everytime the cymbals crashed in the song, the director of the show switched to another camera angle.