The calculated distance (air line) between Zürich (Kreis 4) / Hard and Kriens is approximately 27 miles respectively 43 kilometers.
By car or train, the actual journey to Kriens is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 4) / Hard and Kriens has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles