This is among 4 Marian antiphons, with subsequent versicles and prayers, usually mentioned or sung right after night time prayer, immediately prior to planning to rest. It is said through the close of Eastertide until finally the beginning of Arrival. You might be using a browser that may not supported https://vita-pro-nobis31975.answerblogs.com/31256321/the-2-minute-rule-for-vita-pro-nobis