The hour of mercy is 3:00pm everyday. This is the moment of Jesus Christ agony and abandonment at the cross. At this moment we could unite our selves with Jesus Christ beneath his cross in order in order to entreat for mercy for us and the whole world. The prayer of mercy we say at this time should be directed to Jesus Christ personally. This hour is the time Jesus Christ died. The prayer of mercy should not be confused with the Devine mercy prayer as they are separate prayers. This hour that is 3:00pm is not the entire sixty minutes but that 3:00pm, at this moment we should try to put ourselves in the passion of Jesus Christ and then directly ask him for mercy.