La. Civ. Code art. 2032
Current with operative changes from the 2024 Third Special Legislative Session
Action for annulment of an absolutely null contract does not prescribe.
Action of annulment of a relatively null contract must be brought within five years from the time the ground for nullity either ceased, as in the case of incapacity or duress, or was discovered, as in the case of error or fraud.
Nullity may be raised at any time as a defense against an action on the contract, even after the action for annulment has prescribed.
La. C.C. § 2032