Musnad Ahmad 28:397

'Abd al-Razzaq narrated to us, Ibn Jurayj informed us, I heard Ibn Abi Mulaykah narrating from Yahya ibn Hakim ibn Safwan, that 'Abdullah ibn 'Amr ibn al-'As said: I collected the Qur'an and recited it in one night. The Messenger of Allah (ﷺ) said: "I fear that time may become long for you and that you may become weary, so recite it in every month." I said: "O Messenger of Allah, let me enjoy my strength and my youth." He said: "Recite it in twenty [days]." I said: "O Messenger of Allah, let me enjoy my strength and my youth." He said: "Recite it in ten [days]." I said: "O Messenger of Allah, let me enjoy my strength and my youth." He said: "Recite it every seven [days]." I said: "O Messenger of Allah, let me enjoy my strength and my youth," but he refused.