Bilateral safeguard duration limits: initial cap, exceptional extensions with an overall total cap, and a mandatory cooling off period. Rule 15 limits bilateral safeguard suspensions to the period necessary to prevent or remedy serious injury and to facilitate adjustment. The initial imposition is subject to a fixed cap, with possible exceptional extension on the Director General's recommendation, but extensions are constrained by an overall total duration cap. A cooling off rule prevents reapplication of a bilateral safeguard on the same originating good for a period equal to the prior application, subject to a minimum non application requirement.