This is the dampening interval tied to a custom per-user/group rising threshold, and if only the threshold value was configured but not this interval, ERM falls back to a resource-owner-sub-type-specific default rather than a universal default. Because the fallback default varies by which resource owner sub-type it applies to, an admin cannot assume a default interval value here means the same duration across different resources. A custom rising threshold on the IP Input process paired with no explicit rising interval would inherit whatever default dampening time is standard for the processor memory sub-type, not a fixed global number.