At the start of آمَنُوا, hamzah precedes a madd letter: this is madd badal, read for two counts in the common Ḥafṣ reading.
At the end, the wāw in «نُوا» follows ḍammah and functions as a madd letter. The final written alif is not separately pronounced; ordinary connected length is two counts.
Identify the initial «آ» and terminal «نُوا» separately: their basic lengths can coincide although the underlying categories differ.
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Madd badal versus natural madd in āmanū
Al-ʿAṣr and At-Takāthur: Applied Ghunnah, Madd, Lām and Waqf
At the start of آمَنُوا, hamzah precedes a madd letter: this is madd badal, read for two counts in the common Ḥafṣ reading.
At the end, the wāw in «نُوا» follows ḍammah and functions as a madd letter. The final written alif is not separately pronounced; ordinary connected length is two counts.
Identify the initial «آ» and terminal «نُوا» separately: their basic lengths can coincide although the underlying categories differ.