1,000,001: One to change the bulb and 1,000,000 to rebuild civilization to the point where they need light bulbs again.
or
Only one, but they get three tech. reports out of it.
or
The dentist is taking me out tonight.
or
Unfortunately, no pun in ten did.
or
One. You don't believe me do you? I've got photos! See that big blob? Well, just squint your eyes a bit. . . .
or
Drinking, bathing, washing, swimming, etc.
or