The calculated distance (air line) between Zagorje ob Savi and Grosuplje is approximately 20 miles respectively 33 kilometers.
By car or train, the actual journey to Grosuplje is certainly longer, as only the direct route (as the crow flies) between Zagorje ob Savi and Grosuplje has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles