A Presidential Ordinance can remain in force-

Under the provisions of Article-123, President can promulgate Ordinance to deal with matters of urgent national importance. It can be promulgated anytime except when both the houses of Parliament are in session. An Ordinance issued by President must be approved by Parliament within 6 weeks of its reassembly otherwise it will cease to operate. And since maximum time gap between two sessions of Parliament can be 6 months, the maximum time upto which an Ordinance can remain in force is 6 months and 6 weeks.