How long do you have to be in the army for Until you can leave?

Not a clear enough question...... I will attempt to answer with what I believe your question is.

When a person enlists in the Army they a committing themselves to a contract with that service to serve for the selected amount of years that they agreed to while at MEPS or the Recruiting Station. You are required to serve the duration of your agreed terms of service be it 2 to 6 years. When you have completed your time you are free to leave the Army or you can choose to reenlist.

You are authorized to take leave when you have completed all required training to include Basic Combat Training, Advanced Individual Training and or Airborne or Ranger Training.