Forty Hours' Devotion, called Quarant' Ore or written in one word, Quarantore, is a Roman Catholic practice of devotion where continuous prayer is made for forty hours before the Blessed Sacrament is exposed. It commonly occurs in a succession of churches, with one finishing prayers at the same time as the next takes it up. A celebration of such a devotion is begun by a Solemn Mass or "Mass of Exposition", and ended by a "Mass of Deposition". Each of these masses includes Blessed Sacrament being processed and the litanies of saints being chanted.