Y'all catch a thirty second flash visual
15, 30, and 60 seconds are the normal commercial times for television. In this case, he seems to be referring to the median of the three and using it to possibly hint at the inability for one to understand anything through a mere commercial. That you can’t know anything fully in thirty seconds let alone hear a single song or verse from a rapper and be justified in judging him/her.
A theme echoed in Big KRIT’s “American Rapstar”.
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