The calculated distance (air line) between Bochum-Hordel and Voorthuizen is approximately 82 miles respectively 132 kilometers.
By car or train, the actual journey to Voorthuizen is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Voorthuizen has been calculated here.
Air line (approximately)
132 kilometers
71 nautical miles