Devil’s hour is a term in occult perception that refers to the time at which creatures along with witches, demons, and ghosts are noted to appear and to be at their maximum powerful. Black magic is noted to be most effective at the moment. The duration lasts from 3 AM to 4 AM, when there are no Catholic church services and prayers, as marked via the Canonical hours.
Adversely, the term Devil’s hour applies to the hour of two:33 AM, 3 AM or 3:33 AM, the suggestion being that that is an inversion of the time at which Christ died at Calvary.
The time period can be used colloquially to consult any arbitrary time of awful success, or wherein something awful has a greater chance to arise