(a) Al-Zuhri (may Allah have mercy on him) said: Anas bin Malik (may Allah be pleased with him) informed me that the Messenger of Allah (peace and blessings be upon him) used to lead the Asr prayer, and a person could reach the upper part of Madinah while the sun was still bright.
(b) Imam al-Zuhri (may Allah have mercy on him) said: The distance of the upper part of Madinah from Madinah is two or three miles, and I think he said four miles.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2076