I used the three year cycle as I'm venturing most Romam Catholics attend services once a week and engage in no other Bible study.
I base the latter part of the statement on observations of the postings of Romam Catholics on these threads. For that matter a lot are poorly catechised from what I've seen.
I know in my own study of the Word once a week isn't enough.
“I’m venturing most Romam Catholics attend services once a week and engage in no other Bible study.”
Probably half attend weekly at best.
In some countries, +80% of listed members never attend during a year.