The calculated distance (air line) between Hirschberg an der Bergstraße and Bochum is approximately 150 miles respectively 242 kilometers.
By car or train, the actual journey to Bochum is certainly longer, as only the direct route (as the crow flies) between Hirschberg an der Bergstraße and Bochum has been calculated here.
Air line (approximately)
242 kilometers
131 nautical miles