According to the card, for tea 1–2 tablespoons of oregano are covered with a glass of boiled water, left to infuse for 15 minutes and strained. The card does not name the volume of the glass or the number of glasses a day.
General information (not a manufacturer's instruction): it is better to prepare the infusion fresh and store the herb in a dry place protected from light and out of the reach of children, as stated on the card.