In Genesis 38:12-13, it is mentioned that Judah traveled from Adullam to Timnah, not the other way around. Therefore, the distance you are asking for would be from Adullam to Timnah, not from an Adullamite to Timnah. As I mentioned earlier, Timnah was approximately 11 miles (17.7 km) southwest of Jerusalem, and Adullam was approximately 15 miles (24.1 km) southeast of the city. The distance between Adullam and Timnah would therefore be approximately 26 miles (41.8 km).
Don't know where God is but the Devil is in the details