Zero.
None, change comes from within.
No one knows, they wait for it to burn out and follow it around for twenty years.
Three. One to administer the anaesthetic one to extract the light bulb and one to offer the socket some vile pink mouthwash.
All of them actually. Two to hold the ladder and one to change the lightbulb.
It's 0K.
When they get a hole-in-one they write down *zero* on the scorecard.
