The calculated distance (air line) between Uster / Ober-Uster and Kriens is approximately 30 miles respectively 49 kilometers.
By car or train, the actual journey to Kriens is certainly longer, as only the direct route (as the crow flies) between Uster / Ober-Uster and Kriens has been calculated here.
Air line (approximately)
49 kilometers
26 nautical miles