When somebody, including the voice in your own head, says six months should have been enough, you'll know six months was never the promise. The promise was effort, a bad market, and knowledge that serves you in the long run. Judge the timescale. Not yourself.
When the mirror shows nothing after a month, you'll know that thirty days is not a measurement of you or of the method. It's ten days of tomato seed. You keep the hours. Twenty is gold. Under ten, don't bother.
When February comes and everything in your body says break, you'll know the body was trained for twenty years by a school that is not this one, and that a bow pulled for seven months goes loose in two. Plan for a year. Hit the target. Then go to Antarctica.
You don't have a contract from God that every single thing you do is going to make you successful. You could do everything right, but sometimes things still don't work out. However, the one thing I know is this. If you don't quit, then maybe not today and maybe not tomorrow, but one day, you will be successful and proud of yourself.