Great, a top comment that aims to discourage people from even trying. It's unclear where you got this stuff from (maybe you're a grandmaster too?!) but this is

Great, a top comment that aims to discourage people from even trying. It's unclear where you got this stuff from (maybe you're a grandmaster too?!) but this is well beyond what the author says. He mentions 2 hours per day for 10 years and that it's about consistency, not total time spent.