How long does it take to improve the voice?

There are different variables to consider: the natural or inherent ability of the singer, the singer’s background and history in music, the singer’s commitment to practice using the proper training method, and the “extra” work that benefits a singer in the long-run: ¬†persistence, openness to challenge and stretching his or her limits, and just having fun and being patient in the learning. Results will come. The question is: how well do you want to sing?