In response to
"1 minute is about the useful limit. I've managed to win a few contests and I used to work in the industry, here's the skinny."
by
Subversive - VCP
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Also, this may not be obvious to the listener, but they record the winning call and play it back after the song/commercial.
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Nearly 100% of caller interactions are pre-recorded and played back. The exception is talk/sports radio, but they generally have a 7 second delay so they can dump you if you drop an F bomb or something.
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