How often does the Special Officer report to the President about matters relating to linguistic minorities?
The text does not specify how often the Special Officer reports to the President about matters relating to linguistic minorities. It only states that the Special Officer is to report upon those matters at such intervals as the President may direct, and the President will then lay these reports before each House of Parliament and send them to the Governments of the States concerned. The exact frequency or timing of these reports is not explicitly mentioned in the provided context.