Length vs. echo: time, not texture
The standard
A separate echo assessment keeps both apart: how long the impression lasts and what remains perceptible within that span. It prevents a long but empty span from being taken for a rich echo.
Criteria
- Duration is recorded as a span of time, the echo as what resonates within it
- A long span proves no rich echo
- A dense echo can be short
- Both are named, not merged into a single verdict
Distinction
Length ≠ echo: one measures the time, the other its content. Length ≠ strength of the first impression: the attack in the mouth says nothing about what remains. A separate echo assessment therefore names both quantities individually.