When did the Messenger (PBUH) go to Quba Mosque on Saturday?

Perhaps the Prophet, peace and blessings be upon him, used to walk to Quba in the early part of the day. Evidence for this is his emergence, peace and blessings be upon him, to the people of Quba while they were praying Duha, whereupon he said: "The prayer of the oft-returning [to Allah] is when the young camels feel the heat of the forenoon." Ibn Umar used to pray Duha only on two days: the day he arrived in Mecca, and the day he came to Quba Mosque every Saturday. He used to narrate that the Messenger of Allah, peace and blessings be upon him, used to visit it riding and walking.