Claiming that `Uthman recited the entire Qur'an in one Rak`ah

Q 1: I read in Ibn Qudamah's book "Mukhtasar Minhaj Al-Qasidin" that Amir Al-Mu'minin (The Commander of the Believers), `Uthman ibn `Affan, used to recite the entire Qur'an in one Rak`ah (unit of Prayer). It also states that Imam Al-Shafi`y used to complete a Khatmah (one complete reading of the entire Qur'an) twice a day. However, I read that the Messenger of Allah (peace be upon him) did not allow `Abdullah ibn `Amr ibn Al-`As to complete a Khatmah in less than three days. Are these narrations authentic? (Part No. 3; Page No. 79

A: It is authentically reported that the Prophet (peace be upon him) forbade completing a Khatmah in less than seven, five, or three nights. It is reported that some of the Salaf (righteous predecessors) used to complete a Khatmah in less than this, but scholars hold different views regarding the prohibition. Al-Nawawy (may Allah be merciful to him) said: "It depends on the person. If he is a person of comprehension and contemplation, it is desirable for him to recite the amount that will not disrupt the purpose of meditation and inference of meanings. The same applies to people involved in knowledge, and those responsible for the Islamic and public affairs of Muslims. It is desirable for them to recite the amount that will not disrupt their duties. However, for those who do not fall under such categories, it is preferable for them to recite as much as they can without becoming bored or reciting hastily without understanding."Other scholars consider the prohibition as referring to making it a habit to recite the entire Qur'an in less than three days. Al-Hafizh ibn Rajab (may Allah be merciful to him) said: "The prohibition refers to regular recitation of the entire Qur'an in less than three days. As for blessed times, such as during Ramadan and especially the nights when Laylat-ul-Qadr (the Night of Decree) is sought, and blessed places such as Makkah for those who enter it other than its residents, it is desirable to recite as much Qur'an as possible to benefit from the time and place. This is the opinion adopted by Imam Ahmad, Is-haq and other Imams (initiators of a School of Jurisprudence). It is also supported by the practice of other scholars." (Part No. 3; Page No. 80) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.