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. So, as I mentioned, you should be able to notice these kinds of changes in 1 or 2 lessons. If your voice is REALLY out of balance, it can take 3 to 4 lessons.
But for the average person, 1-2 lessons are correct. If you've been training for months (or God forbid YEARS) and you don't see much vocal progress (assuming you've been practicing regularly), it means that your teacher can't explain things to you in a way that you can understand or that your teacher doesn't understand how to apply vocal function to YOUR voice. In any case, it would be time to move on to a new teacher. 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 plan should not only focus on teacher outreach, but on a combined beneficial plan that also focuses on their goals.
Having a couple of classes a week depending on your needs as a singer is good, but if you think it's not necessary, then we recommend you return to once a week. 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. Because they don't have to travel with their students and can schedule more classes each week, online tutors are also often cheaper than in-person tutors. This will help you set realistic personal goals that improve your confidence and skills by knowing exactly what you want to achieve by taking singing lessons.
Depending on how many habits you need to learn or unlearn, this could also influence the number of lessons you'll need. But everyone, from the shyest shower singers to the professionals, can always learn more about singing. If you are a practicing musician; for example, if you have several residences or go street music every day, then it is true that the more often you have classes, the better it will be for you. 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).
If you can't find suitable or available tutors in your local area, you can always search for tutors who offer online singing lessons. 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. Group tutoring is great if you're on a tight budget, as you can share the cost of the teacher's time and experience with the other students in the lesson. They will also give you an idea of how many lessons or how long it will take you to achieve your goals.
While you won't be able to enjoy classes that fully suit you, you do have the opportunity to work more on your harmonies. 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.