NACHA FAQ:
http://www.neach.org/uploads/resources/doc/stop_payment_qa__31710.pdfQ4. Do I really have to maintain the stop payment on our systems forever?
A. The Regulation E Official Staff Commentary states that once a financial institution has been notified that the consumer has revoked an authorization, “it must block all future payments†for the particular debit. A financial institution may decide that it is appropriate to remove the stop from its system after considering, for example, how long it is reasonably likely that the customer’s account could get debited. However, the financial institution would still violate theregulation if, after removing the stop, it fails to block a subsequent debit under the original authorization.