Unless the order of presentation in a contested case is otherwise directed by the presiding officer, the agency or party who initiated the proceeding shall briefly state the nature of the matters to be heard and proceed with the introduction of evidence. Other parties shall proceed in a like manner and introduce their evidence in such order as the presiding officer may direct. All parties shall have the right to cross-examine witnesses and present arguments. The presiding officer may recess the hearing from day to day or until a later date. At the conclusion of all oral testimony, the presiding officer may leave the hearing open for a period not to exceed 15 days to receive briefs from any party.