I would say the LOTH may be best in terms of time, especially if you desire to follow the calendar and you usually attend the NO. What hours are you saying as a family? If you are interested in the traditional office, Prime and Compline make fairly short morning and evening prayer and have few moving parts compared to the other hours. The Little Office of the Virgin is basically the same every day, and a bit shorter than the Roman Office. The Little Office is probably comparable in length to the LOTH, with less variation but having all the canonical hours. It was a tremendously popular devotion in the Middle Ages, and was used by some religious orders as their proper Office instead of the Divine Office.
ETA: The Monastic/Benedictine Office is a good option too. It is similar to the Roman Office, but the lesser hours are shorter.
Perfect, I'll look into all of these suggestions. Currently we only do vespers on Universalis. Also, we are parishioners at an FSSP parish, so the historical prayer stuff isn't foreign to us. We like that sort of thing. But I'm not proficient enough in Latin to use the language in prayers at home, for sure. It'd be a total mutilation of the work.
Divinum Officium has the prayers in English as well and would flow with the FSSP parish that you attend. I tend to pray it back and forth between English and Latin. I tend to pray the psalms in English because I'm not close to proficient enough in Latin to actually read them and without having to go back and having to reread them in English (they can be quite long). I may read the antiphons in Latin though since they're so short. Hymns depend. If I know the hymn I may sing it in Latin or maybe I'll just listen to it in Latin if I can find it on YouTube, otherwise I just say it in English. Things like the Magnificat, Nunc dimittis, Canticum Benedictus, and the easier/shorter prayers (e.g., Dómine, exáudi oratiónem meam. Et clamor meus ad te véniat.) I'll pray in Latin. It all depends. I tend to use more Latin in compline since the prayers don't change much each night. However, you can also pray the whole thing in English if you want... you're a lay person and have on obligation to pray it either way.
Also with the Divine Office you can choose between the different versions. I like the Divinu Afflatu since it's a bit shorter on most days, but still keeps a lot of the extra prayers (especially the Pater Noster and Ave Maria) and things of that nature. The 1960 rubrics are shorter in many respects. The 1910 Trident version is longer, but the calendar is even more outdated. It sure would be great to get the Divinu Afflatu with an updated calendar (for newer saints) and of course the TLM (preferably with a pre-1955 version of the Mass).