USB high speed or slower is actually quite forgiving but you will eat up bus bandwidth on a range leading up to non-workability because if the minimum quality i

USB high speed or slower is actually quite forgiving but you will eat up bus bandwidth on a range leading up to non-workability because if the minimum quality is met it will keep retrying. I've pulled off some designs without impedance matched traces with lengths beyond 40% of the signal wavelength (well into transmission line worry territory) that had no issues and helped keep production costs down.