Hella.
Two. 1 to screw it in, and 1 to complain that it's not dark enough.
Zero. They don't exist.
One to drop it and six to pick it up pick it up pick it up
None. Mice can't change light-bulbs as they are mere rodents without the physical or mental ability to do so. Not to mention it's much safer for them to pilfer food in the dark.
Hella. How long does it take them Days.
