Rules of the Supreme Court of Canada (SOR/2002-156)

56 A motion for intervention shall be made

• (a) in the case of an application for leave to appeal, within 30 days after the day on which the application for leave to appeal is filed or within 30 days after the day on which the file is opened;

• (b) in the case of an appeal, within four weeks after the filing of the appellant’s factum; and

• (c) in the case of a reference, within four weeks after the filing of the Governor in Council’s factum.