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