To track Proof of Loss response deadlines between you and the insurance carrier, record the date you send the S/POL to the carrier and the date you receive a response.

To clear the POL due date/timer, you would record the date the carrier responded.

In the Demands & Offers record, the field named "DATE RESPONSE REC'D" ends the tracking process. That's the date that the carrier responded to the submitted SPOL.