[exDM69]

You will not distinguish an echo, just a change in the "tone" of the sound you make as it reverberates in your surroundings.

The echo pulses are there but just milliseconds after the sound you made. It will all blur into a softer or harder reverb depending on your surroundings.

To hear an actual separate echo pulse, it would need to be 20-100 milliseconds later than the original sound. That corresponds to a large hall tens of meters in size.