The calculated distance (air line) between Thalwil / Dorfkern and Kriens is approximately 22 miles respectively 36 kilometers.
By car or train, the actual journey to Kriens is certainly longer, as only the direct route (as the crow flies) between Thalwil / Dorfkern and Kriens has been calculated here.
Air line (approximately)
36 kilometers
19 nautical miles