Put this question in the context of any other mentally-challenging endeavor in life. Archery, yoga, marathon running, painting…
If you were going to ask the internet how long it takes to become a professional painter, or, archer, what do you think the answer would be?
Think more in terms of bell curves and your answer being more of a spectrum. For some people, its 3 months, for others its 30 years and they still never get it.
Also, if I take only 1 trade per year and it’s a 20% winner, my annual return is 20% and my win/loss ratio is perfect. So, if you’re someone making 10-20 trades / month, and can make money consistently for 1-2 years, I’d say you’re not a new trader.
I guess when you have gained enough experience that your current trade is not affected by the outcomes of your earlier trades. You have become so strong emotionally that you don’t automatically becomes risk-averse if you had suffered a loss in the previous trade or overconfident if you had made a profit.
There comes a time when making any move doesn’t scare you at all. Initially when I was new with trading, even for making the smallest move, I considered asking the brokers and from friends before it. But now I have the confidence to do it all by myself. Confidence comes from discipline and training.
As to @ponponwei 's question I feel it’s when you feel the confidence and you are great at risk management - make more profits than losses - also if you can keep your emotions in check