The calculated distance (air line) between Duda and Piatra Neamţ is approximately 81 miles respectively 131 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Duda and Piatra Neamţ has been calculated here.
Air line (approximately)
131 kilometers
71 nautical miles