Exception — limit on pleading extension.

If the action challenges the legality, validity or constitutionality of a proposed constitutional amendment, the court shall not extend the time to plead more than two days beyond the time fixed in section 619.2 . [C31, 35, §11123-d1; C39, § 11123.1; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §619.3 ]