I've driven 20 miles home from work with a bad lower end and almost zero oil pressure. KR was pegged at the max 15 degrees and I couldn't hear the bottom end noise until I hit the first stoplight off the highway. After that ...... no one within a half mile had any questions that I'd be swapping that motor

Depending on what/how..you might or might not hear it. I've never heard knock with my ear. I've seen it on a gauge though.