The calculated distance (air line) between Frasnes-lez-Buissenal and Namur is approximately 56 miles respectively 91 kilometers.
By car or train, the actual journey to Namur is certainly longer, as only the direct route (as the crow flies) between Frasnes-lez-Buissenal and Namur has been calculated here.
Air line (approximately)
91 kilometers
49 nautical miles