Musnad Ahmad 8:27

Abu al-Yaman narrated to us, Abu Bakr ibn Abdullah narrated to us, from Rashid ibn Sa’d, from Sa’d ibn Abi Waqqas, from the Prophet, may Allah bless him and grant him peace, that he said: "I truly hope that my nation will not be incapable before my Lord of delaying them for half a day." It was said to Sa’d: "And how much is half a day?" He said: "Five hundred years."