How long do I have to train running to take part in olympic games?

Any ideas?

Depends on the sport you choose, your conditioning, and the time it would take to work up to a competitive state, etc - all unknowns.

Well, it didnt help me much really. I undestand what you said, but I really wanted to hear something like "five years can be enough"

Well, you can't really give a specific amount of time...it really depends on your current physical ability, and how much you train per day/week or w/e, and how well/quickly you progress.

So really there is no specific time that you could say..