Speed of sound 340 meters per second.
Speed of light 300,000,000 meters per second.
one million time faster.
If electricity is ten times slower than light, it is still 100,000 faster. So by the time the current has done 50 meters (150 feets), the sound has done 0.5 millimiter (one fifth of an inch).
THere may be other parameter like resistance of the wire and electrical properties but on speed, nobody can hear the difference on speed only.

PAM