We are suppose to confess in number and kind and I did not know this either. I never confessed the numbers and the priests never asked me. This does not invalidate the confession, but we are suppose to do so.
forums.catholic-questions.org/showthread.php?t=66132&highlight=confess
Let’s think for a minute what this really does.
If you committed a particular sin, once during a monthlong period, that is different than say, committing it 4x that month, or 16, or heck, just say it happened daily.
Now, if you commit this just once monthly and confess it, the confessor is likely to absolve you and give you some advice on it if he thinks you need it. On the other hand, a confessor who sees what amounts to sinful practice that has risen to the level of addiction can do a few things:
- The addiction may mitigate culpability, but does not take away the grave matter (i.e., masturbation).
- The confessor may recommend that you come back weekly to work through it. He can give pointers and help the penitent who truly wants to stop a particular sinful addiction and coach him or her through gradual reduction or other means (i.e., lets reduce it from 7 times a week down some amount).
There are probably more reasons, but these two reasons stand out. And, it is not necessarily the number that counts, but an idea of what kind of level this sinfulness is at. If you are doing something daily, then it’s probably a good idea to tell the priest, “hey, it has risen to a level of addiction”.
Chances are, such a penitent has good company with lots of other penitents.
Here is a really nice article on confession by Pope John Paul II.
ewtn.com/library/PAPALDOC/JP960322.htm