Physical Therapy before ACL surgery?

I tore my ACL almost three weeks ago playing soccer. I am an 18 year old freshman at college and this injury couldn't have come at a worse time as I am an anxious to have the surgery and get back to leading a normal life. After reviewing the results of my MRI the doctor noted that I have bone bruising which requires that I have 4-6 weeks of physical therapy prior to surgery. Is this normal? or should I get a second opinion? I am hoping to ultimately have the surgery within 2 or 3 weeks.