Just one, but they need a backup.
One to screw in the lightbulb, stock four carts of supplies, and handle seventeen simultaneous customers at any one time for five consecutive hours.
Fish.
A hundred but they'll all be competing to be the one to change the bulb and bring light to the world.
Oh, please. Like they've ever changed anything that needed it.
So the violists don't need to be retrained.
A. Hell you need 250 just to lobby for the research grant.
I want to make sure I have a backup before I put this thing on Ebay.