Maybe IR Doing it Rong, but it takes me an hour and 15 to sing matins and lauds form the liturgia horarum.Today, with the full invitatory tone (Rather than a psalm tone) both hymns (Sacris Solemnis AND Verbum Supernum Prodiens) and the sung responsories, (I usually recite those on Sundays since I don't have access to anything with the responsories for the new offices in it) It took me an hour and 35.
I can't imagine having to add one and 1/2 more nocturns to matins,tripling the amount of responsories, and adding two more psalms to lauds. And don't get me wrong, I think that the reduction of matins to a single nocturn of of two very long lessons and responsories was unfortunate, and the triple nocturn of three or nine lessons is the ideal. But if if takes me the long to do what's essentially one nocturn plus an extra reading from matins of the old office of corpus Christi, I can't imagine how long it would take to sing the entire thing. And I don't sing slow. Slow chant becomes boring. So yeah, that's that.