Safeguard measures duration: default expiry with possible extension to address serious injury and facilitate industry adjustment under tariff rules. Safeguard measures under rule 12 are limited to the period necessary to prevent or remedy serious injury and facilitate adjustment. Unless revoked earlier they cease after an initial four-year period, but the Central Government may extend the period if continued imposition is necessary and the domestic industry has taken measures to adjust; however, no safeguard measure may continue beyond ten years from its first imposition.