Consider, for example, the prayer to one's Guardian Angel with specified indulgences (extracted from p. 269 of the 1909 book, [*Mary, Help of Christians*](https://ia801604.us.archive.org/20/items/MaryHelpOfChristians/MaryHelpOfChristians_text.pdf) : I know that presently, the Church does not specify partial indulgences anymore in terms of days; nevertheless, I would like to know: QUESTION: If when one sees promulgated a particular partial or plenary indulgence by a Pope, is it still valid [unless specified otherwise (*i.e,* intended to be of short duration) or revoked by a later Pope?] Remark: I believe that in the case of the above prayer to one's Guardian Angel, the indulgence is still in effect for I recall having seen it in the most recent (1994 or so) *Enchiridion Indulgentiarum* although with a different formula for the prayer. Nevertheless, there have been other indulgences granted by Popes in the past (*e.g.,* Prayer to St. Joseph the Worker by Pope St. Pius X with a 500 indulgence attached to it)---that I do not recall having seen in the Enchiridion. Thank you.