1. 1. There shall be no limit to the length of time goods may remain under a storage procedure.
2. 2. However, the customs authorities may set a time limit by which a storage procedure must be discharged in one of the following cases:
(a)((a)) where a storage facility is operated by the customs authorities and available for use by any person for the temporary storage of goods under Article 151;
(b)((b)) in exceptional circumstances, in particular where the type and nature of the goods may, in the case of long-term storage, pose a threat to human, animal or plant health or to the environment.
3. 3. The measures designed to amend non-essential elements of this Regulation, by supplementing it, laying down the cases referred to in paragraph 2, shall be adopted in accordance with the regulatory procedure with scrutiny referred to in Article 184(4).