The calculated distance (air line) between Hannover and Bochum-Hordel is approximately 124 miles respectively 200 kilometers.
By car or train, the actual journey to Bochum-Hordel is certainly longer, as only the direct route (as the crow flies) between Hannover and Bochum-Hordel has been calculated here.
Air line (approximately)
200 kilometers
108 nautical miles