However, beginners may practice too much and should stop if they feel vocal tension. Taking breaks throughout the day allows those who don't have vocal endurance to practice more daily. Singing students usually practice two hours or more every day. That doesn't include time spent learning to sing at first sight, dictating, playing the piano, and absorbing knowledge related to singing, such as anatomy, music theory, and music history.
The trick is to build it. Start with small, regular sessions (little and often) to increase your strength, and as you get stronger, work a little harder each time. If you want to make changes to your voice in a few months, practice as often as possible. At least one hour a day, six days a week.
If you have time to do more hours a day and do not overdo it with exercises, do not hesitate to do everything that is comfortable for you. If more time is spent on the program, more results will be achieved. Just pay attention and stop if you feel that you feel uncomfortable. The only thing that a voice teacher can truly offer a student is to give the student a solid framework to train themselves to acquire skills to operate their vocal mechanism as efficiently as possible, as well as musical knowledge and artistic understanding and appreciation of singing and performance.
But didn't we just say that there is such a thing as practicing too much? True, and an amateur singer who belts in his car a tune that is out of reach for 2 hours is significantly different from that of a trained vocalist who practices for 2 hours. For example, if you have never sung before and have just started vocal classes, doing 3 hours of practice will not benefit you: the muscles in your voice are not strong enough to hold up to 3 hours of exercise. What matters most to be skilled at singing is that the student trains with a qualified teacher, who practices every day and who practices carefully. If you simply want to learn to sing for the sheer pleasure of it and hope it will lead to more confidence and a better voice in the shower, practicing for 3 hours a week is not going to be a high priority.
They spend a lot of time training and singing scales, practicing phrasing, analyzing lyrics and finding a balance between a solid vocal line, phrasing and emotional distillation of the musical pieces they perform.