how long does it take to learn c++

Hello I'm stormviper and I 16 for the past year I have been doing c++ now and then I started off wanting to be a c++ developer. After a few months I wanted to do something else now I have come back not remembering anything only a few basics. I thought myself in the past how to make a simple 2d platformed game which took me a few months to learn I thought myself because I had problems at school and dropped out I realised in this time I'm good at computers and I can sit at a computer for hours and program. I am asking what is the best way to learn game programming for c++ and how long it will take I can spend five hours or more on a computer a day. I'm new to these forums but I hope this forum is helpful for me. Thank you
learning by doing
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