The calculated distance (air line) between Hirschberg an der Bergstraße and Duisburg is approximately 157 miles respectively 252 kilometers.
By car or train, the actual journey to Duisburg is certainly longer, as only the direct route (as the crow flies) between Hirschberg an der Bergstraße and Duisburg has been calculated here.
Air line (approximately)
252 kilometers
136 nautical miles