system
Given the following post, respond as if you're commenting on Reddit:
human
[DC]Did Batman actually master ALL the martial arts in the world and if so, how?

**yes, i am going to take a comic seriously. shut up, its my hobby.**

One of many OP aspects of Batman is that he has mastered ALL the martial arts in the world.  All of them.  And personally, I don't buy it.  *At most, I would say he is a master of few, and dabbled in the rest.*  And here are my reasoning.

First of all, when the hell did he have time to master it all?  I am going to assume that Bruce started training in martial arts after his parents died, when he was like, 10 years old? Even if he started training before that, it probably wouldn't have amounted to much.

And I would think that his training ended when he came back to Gotham and started acting as Batman.  Sure he could continue practicing and training, but I would think that is not "learning" a new martial arts.

That would give him, like what, 15 years? to master EVERY SINGLE martial arts ever.  

Now let's bring in some pseudo-real science.  They say that it takes an average person 10,000 hours of practice to master one physical thing, whether it be a sport, playing an instrument or a martial art.  That is a 416 days.  Of just training.  Add time to eat and sleep and other daily activity, that would be about 6 years.

Now, of course, Batman is no average human, so let's just say that it would take him 1 year to completely master one martial arts.  

However, there are literally thousands of different martial arts, all over the globe.  Asian, European, African, Scandinavian, etc.  It would take some time just to travel to these places, not to mention finding a master to teach him.

Plus there is time spent learning OTHER important things, such as science etc...

So, how can Batman possibly master ALL form of martial arts?
Does he take just a month or week to master it?
Did he go through some kind of matrix thing to learn all of them?
And does knowing ALL of them actually help, as opposed to being a master of some of them?
gpt
It is easy to disprove this point, primarily because we don't even know how many fighting styles there are in existence to begin with. This is to say that it is much more plausible that he has mastered every single prominent martial art known to man.

As per the feasibility of this feat, you have to take into account that all of these fighting styles converge at some point, this is to say that someone who has mastered Judo would probably take less time to master Jiu-Jitsu as the two have a very similar move set (the founder of Judo, Jigoro Kano, was himself a Jiu-Jitsu practitioner, as was Helio Gracie before he founded the art of BJJ).