Forty Hours' Devotion also called Quarant' Ore or written in one word Quarantore, is a Roman Catholic exercise of devotion in which continuous prayer is made for forty hours before the Blessed Sacrament exposed. Devotion begins on Palm Sunday (Flowery Sunday), a week before Easter and lasts until noon Wednesday.
A solemn high Mass, "Mass of Exposition", is sung at the beginning, and another "Mass of Deposition" at the end of the period of forty hours; and both these Masses are accompanied by a procession of the Blessed Sacrament and by the chanting of the litanies of the saints. The exact period of forty hours' exposition is not in practice very strictly adhered to; for the Mass of Deposition is generally sung at about the same hour of the morning, two days after the Mass of Exposition. On the intervening day a solemn Mass pro pace is offered -- if possible, at a different altar from the high altar upon which the Blessed Sacrament is exposed. It is assumed that the exposition and prayer should be kept up by night as well as by day, but permission is given to dispense with this requirement when an adequate number of watchers cannot be obtained. In such a case the interruption of the devotion by night does not forfeit the indulgences conceded by the Holy See to those who take part in it.
This custom, nourished and presented in a unique way, lives for decades in Komiza, with an exception of the similar in the town of Bari, Italy, speaking clearly about how strong and important is faith in this insular world.