The calculated distance (air line) between Eggenstein-Leopoldshafen and Bochum is approximately 173 miles respectively 279 kilometers.
By car or train, the actual journey to Bochum is certainly longer, as only the direct route (as the crow flies) between Eggenstein-Leopoldshafen and Bochum has been calculated here.
Air line (approximately)
279 kilometers
150 nautical miles