Explanation:

إِذَا  : Alif is Madd Tapyyia (Natural Madd) ( 2 ) Haraks.

جَاءَ  : The  Alif is followed by ( Alif Madd ) length  it Four or five Vowel counts (Haraqahs), Is Called Madd Mutasel.

وَرَأَيْتَ النَّاسَ :  The Hamza in (الناس) is Hamzat Wasl , Drop it in during of reading, And (ل) Laam Shimsiyya drop it as well, And (ن) with Shaddih length it two vowels counts ,

If (ن – م ) with Shaddah length it two vowels counts (2 Haraqahs).

يَدْخُلُونَ  : Qalqalah in (د) , There are five Qalqalah Letters ( ق – ط- ب- -ج – د ) .

أَفْوَاجًا : Madd Tapyyia (Natural Madd) ( 2 ) Haraks.

إِنَّهُ  : Noon (ن) with Shaddih length it two vowels counts , And (ــه) Small Madd Selah 2 Hzaraks  pronounce it like ( هو ) .

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There are Three Madd letters (ا – و – ى )

1. Alif Sakin preceded by Fatiha.
2. Waw Sakin  preceded by Dammah.
3. Yaa Sakin  preceded by Kasrah.