The calculated distance (air line) between Az Zaytūnīyah and Janīn is approximately 36 miles respectively 58 kilometers.
By car or train, the actual journey to Janīn is certainly longer, as only the direct route (as the crow flies) between Az Zaytūnīyah and Janīn has been calculated here.
Air line (approximately)
58 kilometers
31 nautical miles