The Expire On Date functionality allows the requestor to set when the Page Approval will automatically expire.
In order to set this, navigate to a page and click the Page Approval byline. In the settings screen, there's a checkbox labeled 'Expire on Date'. Once you check that, you're able to set the date and time. Please make sure to click Save afterwards.
When a Page Approval expires, it returns to the pending state and e-mails are sent to approvers, requesting for approval.
Note: If your page is restricted, please ensure the ApprovalM user has edit permissions. This is our Addon user that allows the App to modify and expire the Page Approval.