How long before suppressed content stops ranking at all?

Suppression is not a permanent state of the algorithm; it is a continuously maintained outcome. The reasons content resurfaces are predictable. Authoritative replacement content can lose authority over time as the publishing outlet declines in citation count, as the Knowledge Graph reweights, or as the engines update their training. Source-level signals can shift if a previously-deprecated source gains new amplification through a podcast mention, a Wikipedia citation, or a Reddit thread that catches engine attention. New events can revive interest in old content. The durable response is sustained monitoring through IMPACT (which catches the resurfacing within hours) plus ongoing content maintenance to keep authoritative assets current and authoritative. Treating suppression as a one-time project that closes when the result moves off page one is the failure mode that pay-per-page firms produce. Treating it as a continuing operating discipline is what actually holds the picture.