The calculated distance (air line) between Groß-Umstadt and Bochum-Hordel is approximately 137 miles respectively 220 kilometers.
By car or train, the actual journey to Bochum-Hordel is certainly longer, as only the direct route (as the crow flies) between Groß-Umstadt and Bochum-Hordel has been calculated here.
Air line (approximately)
220 kilometers
119 nautical miles