That is a rather complicated question, but I will answer to the best of my ability.
I was a Catholic for most of my life. I did not even know that there was anything but Catholic until I got into 1st grade. The elementary school that all children out of the surrounding 4 villages went to was a Catholic one and I realized that there was something different because one of the children in my class did not have to attend religious education classes with the rest of us.
I went on to become very active in the church. So active that my father assumed I had turned into a fanatic.
In my late teens then I was still actively going to church (even though I also looked into things the church does not approve of like Wicca etc.) and participating, but my job made it harder for me as I hardly ever got home and I did not visit the church in the city I was stationed at. I started becoming increasingly inactive, but I still went to mass and sang in the choir every time I got home.
At that time I couldn’t imagine ever leaving the Catholic faith even though I was starting to recede from it.
When I met my husband I was a more or less inactive Catholic with a few minor doctrinal issues that I simply ignored. Even though I accompanied him to the Protestant service and participated in PWOC (Protestant Women of the Chapel) I still called myself a Catholic even though I was not practicing anymore.
Before we got married we were asked whether there were any issues with us being from different denominations and as I was on the verge of leaving the church for the sake of my marriage I didn’t see any issue. After we got married I started studying into the Catholic faith again, Bible in hand, as my husband wanted to know more about it and I found skeletons I did not like, things that I had ignored or simply believed without questions.
My husband deployed 7 months after we got married and 1 month after that I got saved. I was baptized 2 months later while my husband was in Iraq.
So I can only guesstimate how long it took, but between me getting less active and getting saved it was about 16 months. 18 if you count until my baptism.
Dear sister in Jesus.
My heart just cries when I read such stories… about people like you who had a religion, a belief which was a relationship with the church, but not a relationship with the Lord who is Everything…
How can Catholics go to church all their life and not have a personal relationship with Jesus!!! (I guess thats what you mean by saved).What an absolute poverty among us and much to our shame! Please forgive those who failed to testify.
I am so sad about this and greatly disturbed really.
I think it has to do with the fact that some people talk more about their faith in the Catholic Church than their faith in Christ, they talk more about teachings and philosophy than about testimony of God’s miracles in their life (and ooohh there are so many in the Catholic Church that are saints… mystics… people who saw the Lord, SAW Him yes, who were healed in all kinds of ways… but these don’t get to speak) and many priests seem to refuse to actually PREACH, which is where it all should start…
I think this is where the problem is… the structure is rather sick. We have academics and philosophers giving dry lectures instead of living testimonies.
I am Catholic because Jesus led me here. I have found that in order to thrive here you have to be an elite Christian somehow… but when you get tired and dry there is not much burning heat around you to make you burn again. (I talk about the Church in Europe). It really has become a “me and Jesus-church”. People are left to themselves… them and the Eucharist… as though its taken for granted that they would automatically know what LIFE there is in the Sacraments without ever getting taught with truth and fervor. ( I became Catholic because Christ gave me thirst for His Eucharist). I am blessed to be Catholic,
but I do, I DO, see the illnesses and all the things we need to learn from others in regard to form… and in regard to handing over the reigns to the Holy Spirit much more in our assemblies.
We are the Church and the parish Church is the present church to the believer … that is the Church… not some far away magisterium… but often the Catholic parish does not function because they have become sleeping or lost inside their ideas and theories of “fullness”… Yet what is fullness of faith if we dont have LOVE, TRUE FELLOWSHIP, MIRACLES AND SIGNS THAT JESUS PROMISED WOULD ACCOMPANY THOSE WHO BELIEVE IN HIM?
Sorry for my caps… I know that does not help. But I pray and wish we make our brethren hungry to join us because of a reputation of great brotherly love and wonders in our assemblies instead of focusing on form and liturgy, which, albeit they have their place, must never stifen the life of the free and spontaneous Holy Spirit.

may the Lord have mercy on us all!
We need each other so much, all of us…