Darkness doesn't "travel" in the same way light does, so it doesn't have a speed in the traditional sense. However, darkness appears as soon as light is removed; therefore, you could say darkness returns at the same speed as light.
Think of it this way:
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Light: Light is a form of electromagnetic radiation that travels at a constant speed (approximately 299,792,458 meters per second in a vacuum).
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Darkness: Darkness is simply the absence of light. It's not a thing that moves, but rather a condition created when light is blocked or not present.
Because darkness appears the instant light is gone, its apparent "speed" is effectively instantaneous, mirroring the speed at which light disappears. It's more about the sudden removal of light than the propagation of darkness itself.
