The calculated distance (air line) between Giv'at Shmuel and Netivot is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Netivot is certainly longer, as only the direct route (as the crow flies) between Giv'at Shmuel and Netivot has been calculated here.
Air line (approximately)
77 kilometers
41 nautical miles