Only one... but it will take a few episodes. The lightbulb saga
One... but, what does it matter if she will ask a man to do it !
None. It will change when the fire nation attacks
Three; one to drop the bulb and two to yell "pick it up pick it up!"
Just one. They hold it in place while the world revolves around them.
The Next Episode
Just 1, but It'll take 7 episodes for him to do it.