Sunan Abi Dawud Book 4, Hadith 35
The Messenger of Allah (ﷺ) stayed in Mecca seventeen days and prayed two rak'ahs (at each time of prayer).
The Messenger of Allah (ﷺ) stayed fifteen days in Mecca in the year of Conquest. Shortening the prayer.
Abu Dawud said: This tradition has also been transmitted by 'Abdah b. Sulaiman, Ahmad b. Khalid al-Wahbi, and Salamah b. Fadli on the authority of Ibn Ishaq ; but they did not mention the name of Ibn 'Abbas.
We went out from Medina to Mecca with the Messenger of Allah (ﷺ) and he prayed two rak'ahs (at each time of prayer) till we returned to Medina. We (the people) said: Did you stay there for some time ? He replied: We stayed there ten days.