Is it true that you can learn Krav Maga within a few weeks?

You can "learn" anything in a few weeks, it doesn't mean you'll be good at it. I can teach you to play the piano in under a minute, you still can't play beethoven. The idea that you can learn Krav Maga faster and be more effective with it in a few weeks is a complete load, but you can in fact learn it in a few weeks. You also have to remember that Krav doesn't have much depth because it as designed for fast training and that it's all about teaching simple things as quickly as possible.