Literally dozens.
Just one but he wants to do it thirty-two times and when he's done everyone thinks that his last lightbulb was much better.
Probably one but you can't generalise.
One.
Ten: one to screw it in and nine to say, "Pssh, I can do that."
The guy who can carry a cup of coffee in each hand and a dozen donuts.
Because they're a diamond dozen
A chicken egg.
