InternetSwag

Define full duration. Martial arts end when you quit or die. Well I guess you can only learn so much in a span of 5 or 10 years? What can your sensei teach you after 15 years? Don't you move on to something more challenging eventually?

For example let's say you did Muay Thai for 3 years, would you need to do Karate for the full duration? Would you even need a new Martial Arts style? Is Muay Thai a complete form of martial arts? Would you be better at Karate than a newbie to MA altogether? Because of your Jui Jujitsu or Muay Thai w/e backround?