The presiding officer may fix the time for the filing of briefs. Exhibits may be reproduced in an appendix to a brief. A brief of more than twenty pages shall contain a subject index and table of authorities, Requests for extension of time to file briefs must be made to the commission in writing with one original, one paper copy, and one electronic copy filed with the commission, and a copy served upon or mailed to the parties to the proceeding. Ordinarily, when a matter is to be submitted on concurrent briefs, extensions shall not be granted unless a stipulation is filed with the commission.
Haw. Code R. § 15-15-80