Duty ceases to have effect on expiry of 5 years: 

The anti-dumping duty imposed under this section shall, unless revoked earlier, cease to have effect on the expiry of five years from the date of such imposition

However, if the Central Government, in a review, is of the opinion that the cessation of such duty is likely to lead to continuation or recurrence of dumping and injury, it may, from time to time, extend the period of such imposition for a further period of 5 years and such further period shall commence from the date of order of such extension.

Further, where a review initiated before the expiry of the aforesaid period of 5 years has not come to a conclusion before such expiry, the anti-dumping duty may continue to remain in force pending the outcome of such a review for a further period not exceeding 1 year.