In the Liturgy of the Hours, the daytime Hours (Terce, Sext and None) are designed to cater for all preferences. Specifically, they are designed to cater for people who celebrate all three of them each day and also for people who celebrate only one.
The tricky thing about the daytime Hours is that what psalms you use depends on which kind of person you are. There are “psalms of the day” which should be used each day, once only; and there are “complementary psalms” which should be used at any daytime Hour when you don’t recite the psalms of the day.
