When is the latest I can schedule an exam before it is administered?

Please see the COVID-19 Remote Proctor Updates

Programs can add or cancel exam events, and add or withdraw students, up to an exam’s starting time. You may experience a slight delay when attempting to authorize new additions to the exam. Wait five minutes for the form to be assigned, and the authorization link should populate.

You can edit an exam event (the time, location, exam type) up to one hour before the scheduled starting time. You cannot, however, edit the duration or break time once it has been scheduled. In that case, you will need to cancel the event and reschedule it.