The "permit expiry date" is the date shown on the permit as the date at which the permit expires. Your municipality determines the permit validity period.
You can filter your permits using filter criteria like "Expired" or "Expires within one month" in the Cloudpermit dashboard.
When your permit expires, you must submit a new application in Cloudpermit. The permit application must be approved by your municipality's building authority before issuing a new permit.
Ask with your local building department for more information.