Silsilat al-Ahadith al-Sahihah

Sayyiduna Abdullah bin Amr (may Allah be pleased with him) says: I said: O Messenger of Allah! In how many days should I complete the recitation of the Qur'an? The Prophet (peace and blessings of Allah be upon him) said: "Complete the Qur'an in every month." I said: I am able to do more than that. The Prophet (peace and blessings of Allah be upon him) said: "Then in twenty-five days." ... "Or then in twenty days." ... "Alright, then in fifteen days." ... "If not, then in seven days, (but) whoever completes the Qur'an in less than three days, he has not understood it."