It is just a prayer that honors the Virgin Mary and seeks her intercession. The specific timing of when it can be prayed could change dependant upon person or Local community practices. The hymn is sung (using the English translation "Hail, Holy Queen enthroned earlier mentioned") by a choir of https://encapsuladosvip.com/vita-pro-nobis-descubra-os-beneficios-dessa-incrivel-planta-medicinal/