RCIA is, in my experience, an American thing, at least insofar as the particular “programs” go, what with the set beginning times and what-not.
I am a convert, but neither my husband nor I went through “RCIA”, per se. It so happened that the first priest we spoke to about entering the Church was a visiting priest from the US, and he told us we needed to enter RCIA. But when I asked the pastor about it, our Church does not have an RCIA program. Instead, we spoke to the pastor, who quite nervously asked us about our marital situation. By this time we had been attending Mass for several months, and he knew us. But he had not asked for any details concerning our marital status. When we told him that neither of us had been married before, he visibly relaxed. He is a sweet Franciscan friar, past 80 years old, and his relief was obvious. Once that conversation was out of the way, he said that we could either study with him (which would entail 1.5 hours of commuting each way), or else with a priest at a parish nearer our house. Though that parish used a Japanese liturgy, the priest spoke English.
We studied with the priest near our house for a few weeks, and then we asked if he thought we were ready to enter the Church. He said yes. We had studied a lot in advance before starting to attend Mass in the first place. (I am the daughter of devout Protestants. They are missionaries, even, so converting was not something we did lightly. They have never really forgiven us, either.) So we were received into the Church in September, at a Vigil Mass. Our three daughters, none of whom had reached the age of seven, were all baptized then, too.
It worked for us, and I was very glad that they were willing to work with us, despite the lack of an official program. Still, it would be nice if there were so many people entering the Church that an RCIA class of 50 was necessary!