Musnad Ahmad 1166:13

Harun narrated to us, he said: Ibn Wahb narrated to us, he said: Yunus informed us, from Ibn Shihab, he said: Abdullah ibn Abdullah ibn al-Harith narrated to me, that his father, Abdullah ibn al-Harith ibn Nawfal, narrated to him: That Umm Hani bint Abi Talib informed him: "That the Messenger of Allah (may Allah bless him and grant him peace) came after the day had risen on the day of the Conquest. He ordered a garment, so it was used to screen him, and he performed ghusl. Then he stood and prayed eight rak'ahs." I do not know whether his standing in them was longer, or his bowing, or his prostration; all of that from him was close [in duration]. She said: I did not see him pray them before or after.