This preparation is helpful. When I had the opportunity to go through it, it forced my fiance and me to look hard at some other things that we hadn't thought to discuss. Its length is really immaterial. Most people who truly experience conversion during it are sad when it ends. As far as him feeling uncomfortable, the RCIA process is in place for a reason - to gradually catechize persons to allow them to develop a comfort level with their faith.
Many people go through it who feel uncomfortable.
That is why a sponsor walks the journey with them. I would really recommend that you ask him to try. We have had people who go through the whole year and drop out before the vigil. We try to plant and cultivate the seed of faith with the help of the Holy Spirit, but sometimes the time for the Spirit is not right. My wife took three times to get through.