I have no choice but to wait, so i guess i have to wait. But I don't see the wisdom in the rule.
And the answer to your question, it depends on the individual, everybody enters into Christianity for different reasons and leaves the religion for different reasons.
Some become Orthodox in order to marry an Orthodox, I've seen this, even among the Catholics. However within this group, some become strong believers while others will leave as soon as their wife leaves them. So while the intention is not very sound, the end results may differ depending on the person.
So it depends on the individual.
The practice of taking a long time to enter into the church is in no way new. In the days of the early church, it took years to go from inquirer to catechuman, catechuman to illumined (preparing for baptism), illumined to baptized/chrismated. Note that I said "years." The fact that it's ONLY a year, or 90 days, or a month, etc., to me, is surprising. We live in a sound byte nation, in a world where everything is go, go, go, and we have no patience, wanting what we want when we want it (I'm not accusing you of this, I'm just saying generally).
The waiting period before baptism is not only for LEARNING the faith, it is (more importantly) for LIVING the faith. One can know all the doctrine, quote the fathers, etc. until they're blue in the face. But learning HOW to PRAY, how to come to worship services, how to apply Orthodox thinking to everyday life, how to truly become Orthodox in our way of life-- this is what takes a long time. I'm "cradle" Orthodox, I spent two years at the seminary, and STILL, I'm learning more and more about my faith every day. More importantly, through frequent confession, reading, watching the examples of my husband, my spiritual father, my bishop, and of course through prayer, I'm learning more and more about how to LIVE as an Orthodox Christian every day. THIS is what takes so long. And just when you think you are beginning to get the idea, BAM! God humbles you.
Just be patient, my brother in Christ. In God's time (through the hand of His Holy bishop and His Holy priest who minister to you), you will be initiated into the Church. Just take it as a practice in humility, obedience, and patience (three virtues that we all struggle with, I'm sure). Take the time to learn all you can (if there is no instruction at your church--which there should be--find another church that has instruction or ask your priest privately or call your bishop). Take the time to practice the lifestyle of the Church.
I hope I have not offended you with my words. If so, I apologize as it was not my intent. May God bless you in your journey to the faith and may He guide your footsteps always.
With Love in Christ,