Without guidance, it may take four to five years, which may not be able to get to the point. Forums and various related books are mysterious or ostentatious, but few are really willing to teach you the key points.
If you really want to learn Gann theory, you can study this post and this forum. Most of Gann's technology and theoretical principles are in it:
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After practicing and studying some predecessors and masters who studied Gann, I found that only a few of them could really learn ~ use ~ even excel, and some even published books. Only a few people invested and played Gann's theory well. Therefore, if you ask yourself to be a mortal, it is not recommended to learn from Gann, because it is too difficult to grasp. Even if you learn well, the actual effect is not as high as other methods, or even worse than some other advanced contemporary technologies.
It depends on what stock it is made of. The experience gained from practice is that Gann theory is more suitable for studying the analysis and operation of stock index and futures, but basically not suitable for speculating individual stocks.
This is the experience that I spent a lot of time researching and practicing, and I hope it will help you a little.