The Dark Knight's Career:
Perhaps the most realistic part of Christopher Nolan's Trilogy is the short and violent career of Batman.
Bruce Wayne's training would probably take a decade by normal means, if we were to compare it to becoming a black belt in a martial art. We suppose a secret ninja clan may be able to train Bruce faster, but that may actually hinder him: longer training will make his bones harder and less likely to break, a phenomenon we see in Muay Thai and Judo fighters. In Batman begins, it's unclear how long he trains, but it's over several years.
When you think about it, Batman only has two deadly confrontations (Ra's Al Ghul and The Joker/Two-Face) before he retires. He is then thrust back into action when Bane shows up years later. Compare that to a boxer, UFC fighter, or even an NFL running back, who has a prime portion of their career that lasts 2-5 years before their performance drops.
In The Dark Knight Returns, Bruce is already suffering from the debilitating effects of his lifestyle: a doctor notes the lack of cartilage in his knees and the build-up of scar tissue. Luckily, he has technology to stabilize his knees, but Bane still has youth on his side and proves to be a deadly opponent.
So while Bruce's career as Batman appears to be short, it's actually fairly equal to that of someone in a similarly physical (and deadly) occupation.
We hope you enjoyed this look at the realism of Christopher Nolan's Dark Knight Trilogy. Be sure to check out The Dark Knight Trilogy: Ultimate Collector's Edition, which came out this week. The 6 Blu-ray disk set comes with over 90 minutes of new special features, Mondo villain art posters, and more. You can find it on Amazon.