Upon the conclusion of a hearing the administrative judge shall, by written memorandum to the commission, set forth his findings and recommendations for action by the commission thereon. A copy of such findings and recommendations shall be served on the parties in interest and furnished to commission counsel, and each may submit written exceptions thereto and written argument thereon within 10 days after service of such findings and recommendations. A copy of the exceptions and arguments shall be served upon each of the other parties in interest or commission counsel, as the case may be. Replies to exceptions and argument may be served in like manner within five days after service of such exceptions and arguments. Unless the commission grants an extension of time, exceptions, argument or replies submitted after the prescribed time need not be considered by the commission.