§1. Unless the discussion reveals that something must be supplied in the instruction of the case or something else turns up which prevents a proper pronouncement of the sentence, at the completion of the hearing the judge in private is to decide the case immediately; the dispositive part of the sentence is to be read at once before the parties who are present.
§2. The tribunal can defer the decision up to the fifth useful day because of the difficulty of the matter or for some other just cause.
§3. The complete text of the sentence with the reasons expressed is to be communicated to the parties as soon as possible, ordinarily in not more than fifteen days.
Source: Code of Canon Law (Vatican.va)