Or a little more, and recite the Qur'an slowly and distinctly.
4
Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (or add (a little) thereto) or pray more than half of the night, up to two thirds of the night, thus giving him a choice, and then he said: (and chant the qur'an in measure) recite the qur'an deliberately, unhurriedly and with gravity, i.e. reciting two or three verses each time until you finish the whole recitation,
Jalāl al-Dīn al-Maḥallī
تفسير : or add to it, up to two thirds (aw implies [free] choice), and recite the qur’ān, recite it carefully, in a measured tone.