Hadith 2179
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294. Amīr al-mu’minīn, peace be upon him, was asked about the distance between East and West when he replied: One day’s travelling for the sun.
٢٩٤. وَقَدْ سُئِلَ عَنْ مَسَافَةِ مَا بَيْنَ الْمَشْرِقِ وَالْمَغْرِبِ فَقَالَ (عليه السلام): مَسِيرَةُ يَوْمٍ لِلشَّمْسِ.