The calculated distance (air line) between Bad Neuenahr-Ahrweiler and Duisburg is approximately 63 miles respectively 102 kilometers.
By car or train, the actual journey to Duisburg is certainly longer, as only the direct route (as the crow flies) between Bad Neuenahr-Ahrweiler and Duisburg has been calculated here.
Air line (approximately)
102 kilometers
55 nautical miles