Only one, but it takes nine years.
Just one, but it takes a really long time, and the lightbulb has to want to change...
Two. Plus a portable phone an Internet link and a copy of the "Bluffer's Guide to Changing Lightbulbs."
None because There is A Light That Never Goes Out.
Doesn't matter, just use the jet fuel instead.
How many did it take last year
Cuz he's Biden his time.
Only one but it may take him/her more than five years to do it.