Answer:
There is no "appropriate time frame" that makes a customer liable for unauthorized electronic funds transfers. You must comply with the error resolution procedures of Section 205.6. You will want to specifically study the requirements in Section 205.6(b)(2) and (3) - Timely Notice Not Given, if you believe the customer knew the errors occurred and didn't notify you.
First published on BankersOnline.com 2/19/07