i. 300 Days, for each day, to all who shall honour the Blessed Virgin, during the month of May (in public or in private), with prayer or other devotion.

ii. Plenary, once in the month (or on one of the first eight days of June), to all who keep up this devotion every day during the month. (Special Conditions: Confession, Communion, Prayer according to the Pope’s intention.)

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Decrees of the Sacred Congregation of Indulgences:
Pius VII. Secretariate of Memorials, March 21, 1815.
Pius VII. June 18, 1822.