Volume 6, Book 61, Number 574:
Narrated ‘Abdullah bin ‘Amr:
Allah’s Apostle said to me, “Recite the whole Qur’an in one month’s time.” I said, “But I have power
(to do more than that).” Allah’s Apostle said, “Then finish the recitation of the Qur’an in seven days,
and do not finish it in less than this period.”