One, but only if the lightbulb really to change.
Doesn't matter. Lightbulb is going to die anyway.
None. It will change when the fire nation attacks
None, we just swap out your whole house
Oh well, I'll figure it out later.
The patients are the ones who eventually get better and get to go home.
Just one, but it takes a really long time, and the lightbulb has to want to change...