Louisiana Revised Statutes Tit. 9, § 1831. Limitations upon stipulated term

(1) The death of the last surviving income beneficiary or the expiration of twenty years from the death of the settlor last to die, whichever last occurs, if at least one settlor and one income beneficiary are natural persons;

(2) The death of the last surviving income beneficiary or the expiration of twenty years from the creation of the trust, whichever last occurs, if none of the settlors is a natural person but at least one income beneficiary is a natural person;

(3) The expiration of twenty years from the death of the settlor last to die, if at least one settlor is a natural person but none of the income beneficiaries is a natural person;

(4) The expiration of fifty years from the creation of the trust, if none of the settlors and none of the income beneficiaries is a natural person.