Summary

Yosef Karo Translation:Shulchan Aruch — Orach Chaim 577…

If it all happens fast and there is no time to blast in the established order of other fasts, no fast is imposed on the public, because they can't fast every day. Instead, blasts are sounded each day and in each prayer service, and verbal blasting is sufficient. If individuals want to fast, they are authorized to, with verbal blasting, which is saying the prayer "Answer us our Father, answer us!"
Source: Wikisource

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