The calculated distance (air line) between Fayrōz Kōh and Darzāb is approximately 101 miles respectively 163 kilometers.
By car or train, the actual journey to Darzāb is certainly longer, as only the direct route (as the crow flies) between Fayrōz Kōh and Darzāb has been calculated here.
Air line (approximately)
163 kilometers
88 nautical miles