From a seminarian:
I am a seminarian for ___ and have recently begun reciting the Divine Office using the traditional breviary. Some other seminarians and I are now wondering if a priest is still only bound to recite 5 of the hours even when saying the older form, or if use of the older form binds the priest to say all the hours. I was wondering what your thoughts are.
Thank you so much for all that you do. You are a true inspiration to us who are still in formation.
First, even though you are a seminarian for diocese with a sane bishop, keep your use of the older, traditional office to yourselves.
The answer to your question is found in the document from the Pontifical Commission “Ecclesia Dei” called Universae Ecclesiae, which helps to interpret several points in Summorum Pontificum.
32. Art. 9 § 3 of the Motu Proprio Summorum Pontificum gives clerics the faculty to use the Breviarium Romanum in effect in 1962, which is to be prayed entirely and in the Latin language.
However, if you are not ordained at least as deacons, this does not apply to you, as you are not clerics. You can do as you please… just keep it to yourselves!