A missed approval deadline is not a locking factor. However, to avoid elapsed deadlines, Approvers are sent a reminder message both 24 hours prior to and on the actual deadline. If a deadline is still not met, the respective request will be marked as Overdue in the list of requests.
Organisation Administrators, Requesters, Reviewers and Approvers can send reminders (email notifications) to Approvers and/or Reviewers who haven't yet acted on a request.