Lock TTL in milliseconds. Must exceed the job's worst-case runtime.

Bounds TWO distinct guarantees (M70l C3): how long the per-handler OVERLAP mutex lives after a holder dies without releasing, and how long a claimed fire SLOT is remembered before a late replica may re-run it — slot locks are never released, so this value is the replica-skew window. A value below the maximum skew between replicas lets a slow replica re-run an already-claimed fire.