Over the course of ten weeks

Basic Combat Training (BCT) is a training course that transforms civilians into Soldiers. Over the course of ten weeks, recruits will learn basic tactical and survival skills along with how to shoot, rappel, and march. They will also learn the basics of Army life and military customs, including the Seven Core Army Values

 http://www.goarmy.com/soldier-life/becoming-a-soldier/basic-combat-training.html