As per hadith it is the journey of three days. As per the scholar of hadith and Fiqh, it is 4 barid or 16 farsakh; one barid is equal to 12 English miles and one farsakh is equal to 3 English miles. Thus, 4 barid is 48 miles and 16 farsakh is also of 48 miles. The same has been written by our elders i.e. Hadhrat Maulana Rasheed Ahmad Gangohi, Hadhrat Maulana Ashraf Ali Thanvi, Hadhrat Maulana Mufti Azizur Rahman Grand Mufti Darul Uloom Deoband, Hadhrat Maulana Mufti Muhammad Shafi (رحمہم اللہ) etc. They have opted 48 English miles which is equal to 77.25 kms. Some Ulama have counted it with Shariah mile thus they measure it as 54 miles. We issue fatwa as per our elders.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband