Only one but it may take him/her more than five years to do it.
It's this really obscure number. You've probably never even heard of it. No big deal.
None. They'll just stand in the dark talking about how good the old one was.
If you lay them right the first time, you can walk all over them for years.
Because they can spend years at sea.
5... 1 to hold the bulb and 4 to spin the chair
Three - one to change it, one to not-change it and one to both change-and not-change it.
One to change the lightbulb and one to drive down to Kent to pick him/her up.
Only one, but it takes nine years.