The calculated distance (air line) between Bad Neustadt an der Saale and Duisburg is approximately 169 miles respectively 271 kilometers.
By car or train, the actual journey to Duisburg is certainly longer, as only the direct route (as the crow flies) between Bad Neustadt an der Saale and Duisburg has been calculated here.
Air line (approximately)
271 kilometers
146 nautical miles