The calculated distance (air line) between Sai Kung and Tai Kok Tsui is approximately 8 miles respectively 13 kilometers.
By car or train, the actual journey to Tai Kok Tsui is certainly longer, as only the direct route (as the crow flies) between Sai Kung and Tai Kok Tsui has been calculated here.
Air line (approximately)
13 kilometers
7 nautical miles