Final answer:
The exact timing for a 'general broadcast' as referenced in the question is unspecified, but the context involves the equal-time rule in broadcasting regulations. Details about audience attention spans are provided as part of public speaking strategy.
Step-by-step explanation:
The question pertains to the regulations and requirements media outlets, like television and radio stations, must adhere to in relation to political broadcasts and advertisements. Specifically, it involves the equal-time rule which mandates that all registered candidates running for office should be afforded equal opportunities for airtime and advertisements. With reference to the examples provided for the timing of general broadcasts and engagement, none directly answer the question posted. However, it is noteworthy that public speaking engagements and social media posts have their own constraints on timing to capture audience attention. Live adult audiences, for example, typically pay attention for about 20-minute increments before distraction sets in. In the context of broadcasting regulations, the exact timing for a 'general broadcast' requirement is not provided here and might be specific to certain regulations or guidelines not mentioned in the provided material.