How long does a 12 year old's buckle fracture in the radius take to heal?

Well i was at school right, playing a game of football(soccer) in P.E, so me and another very big kid went for the ball, i fell to the floor because of the force he had when he hit me, and i landed on it awkwardly then the bigger kid fell on my wrist whilst it was bent completely putting me in alot of pain, so i sit out and go to the medical department to get a bloody ice pack, so i go back to get changed and it was hell getting changed as any tiny pressure on the hurt left wrist would hurt so bad, so i go back to the medical department and they call my mum to pick me up and send me home to get it checked. so we go up the hospital and get it x-rayed, i had'nt thought that i actually broke it, i thought i might of just broosed it , because it only hurt bad when pressure was put on it, so we get the results to find out i had a buckle fracture in my radius. could somebody please help me as to how long it will take to heal as i need it quick because i play for a football team and they need me. Thanks guys, please help.