While a proclamation of emergency is in operation the duration of the Lok Sabha can be extended for a period - (1) not exceeding three months (2) not exceedng nine-months (3) of one year at a time (4) of two years at a time
(3) of one year at a time Explanation: While a proclamation of emergency is in operation, this period may be extended by Parliament by law for a period not exceeding one year at a time. Under Article 352 the president can declare a national emergency when the security of India or part of it is threatened by war or external aggression or armed rebellion.