Tajweed RulesIf a moving (voweled) mim follows the sakinah mim, the first is merged into the second with ghunnah for the duration of two harakahs, becoming a single doubled (shaddah) mim; this is called 'the minor idgham of two identical letters' (idgham al-mithlayn al-saghir).
لَهُم مَّا يَشَاءُونَ — كَم مِّن فِئَةٍSource:تحفة الأطفال
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If any letter other than ba and mim follows the sakinah mim, the mim must be pronounced with a clear labial idhhar, without ghunnah.
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The madd (prolongation) without which the letter itself cannot stand, and which does not depend on a hamzah or a sukun; it is prolonged for the duration of two harakahs.
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That a hamzah comes after a letter of madd within a single word; its ruling is obligatory, and it is prolonged for four or five harakahs whether continuing (wasl) or…