Orthros is the longest and most complex of the daily cycle services.

- Sunday: the longest of the regular orthros services. If this service is celebrated in its entirety it can last up to three hours. It contains three canons, apart from any additional festal cannons which may be added. As a result, in most practical situations, abbreviations are made. Often, this Orthros is part of a vigil.

- Feast day Orthros with Gospel.

- Lenten Orthros: penitential material added (hymns and prayers).