The calculated distance (air line) between Boshkengash and Kŭlob is approximately 65 miles respectively 105 kilometers.
By car or train, the actual journey to Kŭlob is certainly longer, as only the direct route (as the crow flies) between Boshkengash and Kŭlob has been calculated here.
Air line (approximately)
105 kilometers
57 nautical miles