If it elects to hear oral argument, the Reviewing Board shall advise all parties and any amicus curiae of the time and place of hearing. A request for postponement of the argument shall be made by motion filed reasonably in advance of the date fixed for hearing. The appellant shall argue first. Each party shall be allowed 15 minutes for argument unless the time is extended or limited by the Reviewing Board. In advance of oral argument, a party may request additional time, which will be granted only under unusual circumstances.