I put in 2 hours per day into my Amazon business, is this enough to make it a profitable business that will allow me to quit my job?

Excellent question and the answer is not going to be straight forward like you expected.

How bad do you really want to grow this business?

Number one thing I ask is what are you doing the other 22 hours per day?

How much do you need to make in order to quit your job?

You need to know that when you make 10K per month, that means you are taking home 2500 or 3000, and if you do use that amount, next month your business will not be able to make 15k or 20k, because you took money out and stopped the growth.