The calculated distance (air line) between Bochum-Hordel and Leverkusen is approximately 34 miles respectively 54 kilometers.
By car or train, the actual journey to Leverkusen is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Leverkusen has been calculated here.
Air line (approximately)
54 kilometers
29 nautical miles