bonus question: how did this work when phone calls were still a relatively new thing?
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Only way your question would work is if you tried to shout from San Francisco to New York.
Then, yes, your voice would be travelling, as sound, at 767 mph and would take hours to get to NY.
But what actually happens is, as many have said, your voice jumps into the Millenium Falcon and gets to NY in milliseconds, then jumps out of the Falcon and becomes sound again.
Bonus points: this works because the fluctuating electrical signals are used to make an electrical magnet turn on and off really fast, which makes a thin metal disc vibrate, bingo, you have a speaker that reproduces the sounds.
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