The calculated distance (air line) between Diepsloot and Bronkhorstspruit is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Bronkhorstspruit is certainly longer, as only the direct route (as the crow flies) between Diepsloot and Bronkhorstspruit has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles