It sounds like your expectations and his are not jiving. What is it that you want from your lessons? 1/2 hour is usually enough as long as it's focussed. My teacher's philosophy is to teach the theory and reasons behind the music so that his pupils can then figure things out for themselves. It requires dedication from the students.
You should figure out what it is you want to learn and discuss it with your teacher.
Perhaps he's not the teacher for you.
"we don't see things as they are, we see things as we are" - Anais Nin
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