Reference: Siyar A’laam an-Nubalaa – Volume 4, Page 50
al-Aswad ibn Yazeed would complete [reading] the Qur.aan every two days during Ramadhaan, and he would sleep between maghrib and ‘ishaa.
And in other than Ramadhaan, he would complete [reading] the Qur.aan every six days.
While from one angle this worship is something praiseworthy, it must be noted that adhering to the Sunnah takes precedence, as it has been authentically reported that the Prophet (sal-Allaahu ‘alayhi wa sallam) prohibited ‘Abdullaah ibn ‘Umar (radhi-yAllaahu ‘anhumaa) from reading the entire Qur.aan in less than three days and nights, as he (sal-Allaahu ‘alayhi wa sallam) said:
And commenting on this, Shaykh al-Albaanee said: