Looks like a minimum of 3, 6 or 9 months depending on the Grade, let's just hope it scans as Grade 1.
Grade 1 (Minor sprain):
The ACL is mildly damaged with small tears, but the ligament is still intact.There's slight stretching, but the knee joint remains stable.
2. Grade 2 (Partial tear):
The ACL is partially torn, which results in some loss of stability. The ligament is stretched to the point where it is loose, but not fully torn.
3. Grade 3 (Complete tear):
The ACL is completely torn or ruptured, resulting in significant instability of the knee.