What Is The Recovery Time Of Fractured Tibia?

good evening .sir i am fahad,i got accident on 19-05-2010.hit by car and i got fracture in tibia .i was addmitted in the hospital and they put the plaster. after five days they take x- ray crack.and the doctor says to me you take discharged.the doctor says come after 15 days. i went to the doctor after 15 days.and we are taken x-ray and get gap.i asked the doctor last 15 days in the x-ray only the crack and know is their gap the doctor say to me calcium eat the bone after the 4weeks you will dont see the gap.i dont know what to do please sir tell to me.