How long would it take for a sound impulse to travel through a copper rod at 25 kilometers long

the higher the current the higher the mag field around it the higher the influence on the compass

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.