It is recommended that you take singing lessons at least once a week, but preferably twice a week, in order to continue developing your skills. For those who already have some training and confidence in singing, it usually takes less than that, approximately 3 to 6 lessons. Normally, students benefit from more than one 60-minute class each week to work in-depth on their voice and watch a song at the same time. This gives the teacher, and you as a student, an idea of how well you are practicing and progressing.
Do you want to sing smoothly from the bottom to the top of your range? You might want to have the ability to sing loud high notes, or you might want to fix your pause first. The number of lessons you need depends on where you want to go. It's important to set your own goals and communicate with your voice teacher. As you improve, your goals may change slightly, as you can do more with your voice as you develop it.
The standard frequency of classes is one class per week. Some people want to do more right from the start and others want to do less than that. For most people, I recommend consistent weekly classes as optimal if possible for them. In my experience, people who plan to do two or more lessons a week find that they don't actually progress much faster.
It takes time for the body to develop new habits, and singing is a rather sophisticated process for the body, since many things have to align. Singing lessons may be the answer to many of these questions, but what many people want to know above all is how many singing lessons are needed to become a better singer. Usually, these people end up dropping out of classes out of frustration, they don't find the time to practice at home, etc. While I think it's really valuable to be willing to spend more time and money on singing instruction, in my experience, it's better to follow a weekly lesson and instead focus on practicing regularly at home.
The more you are able to judge for yourself what you are doing wrong and the more tools you have to solve it, the fewer lessons per month you can take. I argue that it is NOT advisable to take daily voice classes, and that the highest frequency should be twice a week. It's also a great idea to record yourself during each voice lesson so you can listen literally afterwards to hear how you're improving and compare your progress each time. There are a lot of online courses you can do, but again I recommend starting with individual or group classes first so that you have real feedback on what is happening with your voice.
However, as a beginner, be careful not to overdo it, as this can be very harmful and easily tire you both vocally and physically. Acquiring knowledge takes a lifetime, so if you only want to take classes for a few months, or you have a slower temper to learn and understand, this will obviously have a different outcome than the current singing lessons. Therefore, a new student needs to be under the right guidance as often as possible; while a more advanced student who already has well-established good singing habits may be able to get away with taking classes less often. The only way a good singer can stop thinking about his voice and start thinking about the songs he is singing is by training his usual vocal patterns to the point where healthy vocal technique is on autopilot.
If you're with a good teacher who understands vocal function, you should start to notice some kind of difference within 1 or 2 lessons (assuming the teacher can explain things to you in a way that you understand AND you can make you do it). Depending on how many habits you need to learn or unlearn, this could also influence the number of lessons you'll need. With these recordings, the student can practice the specialized lesson plan that the teacher has developed for them between classes. .