"The Messenger of Allah (ﷺ) used to pray 'Asr, then a person could go to Quba'." One of them said: "And he would come to them when they were prayed." The other said: "And the sub was still high."

Both Az-Zuhri and Ishaq bin 'Abdullah narrated it from Anas, so the reference is about them.
Sunan an-Nasa'i Book 6, Hadith 13
← Previous Hadith It was narrated from 'Aishah that the Messenger of Allah (ﷺ) prayed 'Asr when the sun was in her room and the shadow had not appeared on her wall.

Sunan an-Nasa'i Book 6, Hadith 12 Next Hadith → "The Messenger of Allah (ﷺ) used to pray 'Asr when the sun was still high and bright, and a person could go to Al-'Awali when the sun was still high."

Al-'Awali is the southern most district of Al-Madinah, and it is very big. Its nearest limit is at a distance of about two miles from the center of Al-Madinah. While its furthest limit is about eight miles.

Sunan an-Nasa'i Book 6, Hadith 14