I did this sub for over a month along with a second sub. I must admit that I usually didn’t get the full exposure of 8 hours because of the other sub (usually I was between 4 and 6 hours). But, still, I got noticeable results. I got a better understanding of math and I was able to learn math stuff quicker than before. I was also more interested in math, and at some point it was even fun to do math! I know one day I was like “Ah, good time for a movie. Ehhh, no, I do some math instead.” I would have never said something like this before.