We’re making this more complex than it has to be.
Canon Law speaks about religious life in broad strokes. It leaves the major differences to theology. Canon Law is not theology. It is based on theology. For that reason it says that religious pray the Liturgy of the Hours according to their laws.
So who prays the Liturgy of the Hours.
All religious who make solemn vows pray the LOTH. Only those religious who make solemn vows belong to a religious order. These are hermits, canons founded before the 1500s, friars, monks, nuns, and Jesuits. That’s it. These are the religious bound to pray the entire set of Hours.
What about everyone else?
All other religious belongs to a congregation. Congregations make simple vows. Men and women in simple vows are not bound to pray the LOTH. All sisters are members of congregations. Therefore, all sisters make simple vows and are not bount to pray the LOTH.
Religious congregations of men are: Vincentians, Passionists, Salesians, Canons of St. John Cantius, Redemptorists, Xaverians, Christian Brothers, Marists, Missionaries of Charity.
Religious congregations of women are all congregations of sisters.
Diocesan priests are not bound to pray all of the hours. They must pray certain hours. This is usually determined by the diocese. Usually, they will pray: Morning Prayer, Evening Prayer, Night Prayer and Office of Readings. Diocesan deacons (permanent or transitional) pray Morning Prayer and Evening Prayer. Diocesan clergy are not bound to pray in common. This is optional for them. In most rectories they don’t pray together.
Conclusion:
Religious orders, because we must pray the LOTH, since we make solemn vows, decide what hours they will pray in common.
For example, my community prays Lauds, Vespers, Matins and Compline in common. We pray the minor hours alone.
Congregations, because they are not bound to pray the LOTH, since the make simple vows, can choose to pray the Hours or not to do so and pray any other form of prayer such as the Little Office of the BVM. This was very common among sisters, once upon a time.
Today, many congregations of sisters and men are electing to pray at least some hours in common. Also, if the founder wrote it into the founding statutes, they must pray the LOTH.
Finally, each community prays using the breviary, calendar, language and form according to its customs. There is no universal way of praying the LOTH. There never was.
Fraternally,
Br. JR, OSF
