The calculated distance (air line) between Bochum-Hordel and Maassluis is approximately 129 miles respectively 207 kilometers.
By car or train, the actual journey to Maassluis is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Maassluis has been calculated here.
Air line (approximately)
207 kilometers
112 nautical miles