Each voice is unique and has its own strengths and weaknesses. The process of honing one's singing voice differs from person to person. It all depends on the quality of your voice and the amount of effort and practice you're willing to put in to reach your full potential. After about three months, some people will hear a difference in their voice, especially if they already have a naturally pleasant voice. Others may see it in six months. As we already mentioned, the more you practice, the quicker your voice will improve. You may need six months or more to hear a change in your voice or a whole year. It all depends on how tirelessly you're willing to work for it.