The calculated distance (air line) between Thalwil / Dorfkern and Bern is approximately 58 miles respectively 93 kilometers.
By car or train, the actual journey to Bern is certainly longer, as only the direct route (as the crow flies) between Thalwil / Dorfkern and Bern has been calculated here.
Air line (approximately)
93 kilometers
50 nautical miles