Only one, but it takes nine years.
Two. One to screw in the lightbulb and another to sing about all the good times they had with the lightbulb.
1001 1 to offer up the bulb and 1000 to scream 'Get in the hole'
To change sides.
Removed
Because it doesn't take four years to learn how to make a sandwich.
Ten years Ten months Ten-" "Nine... Eight..."
Only one but it may take him/her more than five years to do it.