§1. Restitutio in integrum for the reasons mentioned in can. 1645, §2, nn. 1-3 must be sought from the judge who rendered the sentence within three months computed from the day the person became aware of these same reasons.
§2. Restitutio in integrum for the reasons mentioned in can. 1645 §2, nn. 4 and 5 must be sought from the appellate tribunal within three months from the notice of the publication of the sentence; if in the case mentioned in can. 1645, §2, n. 5 notice of the previous decision occurs later, however, the time limit runs from this notice.
§3. The time limits mentioned above do not run as long as the injured person is a minor.
Source: Code of Canon Law (Vatican.va)