When an object is thrown horizontally off a cliff, its horizontal motion does not affect the time it takes to hit the ground, as gravity acts independently on the vertical motion. Both scenarios, whether the object is dropped or thrown, result in the same vertical acceleration due to gravity. The horizontal component of motion does not influence the downward motion, making the time to fall identical in both cases, assuming no air resistance. If air drag is considered, it could alter the trajectory and time, but the fundamental principle remains that gravity governs the fall. Therefore, the time taken to reach the ground is the same for both actions.