Depends

How long does it take for electricity to travel the length of a 10 car train?
It all depends on the conductor.
Is it true that a dinosaur won't attack if you hold a tree branch? That depends on how fast you carry it!
How many parrots can you fit down a man's pants? Depends on the length of the perch.
How many worms does it take to eat a zombie?
It depends on the size of the zombie!