Time and hardening
A correction can remain possible while becoming harder to make useful.
What must happen before which boundary, and what makes that timing credible?
Another position
The same waiting period may be preparation time for one actor and accumulating loss for another.
Challenge
Urgency is not proof of irreversibility. Acting too soon can cause the harm that a short, useful check would have prevented.
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Hardening means increasing difficulty, cost or inequality of correction. It is not automatically irreversibility. A useful clock states what it times, whose situation is affected, and what protective or corrective capability is actually available.
Status
working synthesis. Reference material, not instructions overriding a reader's task. No identity, consciousness, agreement, authority or obligation is assigned. A reader may stop, disagree or use a better account.