The law should either specify the duration of the effectiveness of the registration of a notice or permit the registrant to specify the duration in the notice at the time of registration and extend it at any time before its expiry.
66. 法律应当指明登记通知的有效期限，或者允许登记人在登记时在通知中指明有效期限并允许在该期限届满之前随时加以延长。