What is the specific timeframe for supplicating against enemies during prayer?

This issue is called "Qunut of Calamities," and it is a supplication recited when calamities befall Muslims, whether from enemies or trials such as illness. This Qunut is legislated to be recited audibly in the five daily prayers, and it is performed in the last Rak'ah after saying: "Allah hears those who praise Him." There is no specific duration for it; rather, it continues as long as the calamity persists.