Recently, I feel lazy praying certain hours of the office. Among them is daytime prayer and the OoR. Yet I still make it a point to pray Lauds, Vespers and Compline except when I will attend the 8 am Sunday Mass in my Parish or the 6:30 am daily Mass in the school chapel (on which I forego praying Lauds).
Am I doing something wrong or sinful? (Considering that I am a lay person) If so, should I set a strict schedule for praying the hours? Thank you.
No…if you have not assumed an obligation to say the Office, then it is not sinful to not say the Office.
The Divine Office is a beautiful form of prayer…but not everyone profits from it, or at least praying it in its entirety.
Some people who were greatly benefited at one season of life by it may find themselves more enriched by something else at another season of life. As a lay person you would have that freedom to make that self-adjustment that we who are clerics do not.
If you have time constraints, it is understandable that you use the time in the morning that you are able to budget for prayer to make Mass and then, at other times of the day, pray the Office.
The Office of Readings has the advantage that is it ordered so that it can be prayed at any time during the day or even the evening before.
There are always moments in the spiritual life when we have to push ourselves, as we can pass through moments of aridity and, when that is the case, we may not always feel like praying but you or your spiritual director could better judge that circumstance than people on a forum who do not know you.
On the other hand, we should not tie up for ourselves burdens too ponderous to reasonably carry by setting a prayer routine that exceeds what we can do and that leaves us discouraged.