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1. The duration of safeguard measures must be limited to the period of time necessary to prevent or remedy serious injury and to facilitate adjustment on the part of Union producers. The period must not exceed 4 years, including the duration of any provisional measure.

2. Such initial period may be extended, except in the case of the measures referred to in the third subparagraph of Article 15(4) provided it is determined that:

(a) the safeguard measure continues to be necessary to prevent or remedy serious injury;

(b) there is evidence that Union producers are adjusting.

3. Extensions shall be adopted in accordance with the terms of Chapter III and using the same procedures as the initial measures. A measure so extended shall not be more restrictive than it was at the end of the initial period.

4. If the duration of the measure exceeds 1 year, the measure must be progressively liberalised at regular intervals during the period of application, including the period of extension.

5. The total period of application of a safeguard measure, including the period of application of any provisional measures, the initial period of application and any prorogation thereof, may not exceed 8 years.