Lenorem9 is right- an isolated LCL rupture is not common. Unfortunately, I too, cannot directly relate to your series of injuries and courageous mechanism of injury. However, I have recently had a posterolateral ligament reconstruction (and ACL revision) 4 wks ago. Thankfully, my LCL and popliteus were intact. My problem was that my posterior capsule was severely deficient, causing too much hyperextension. Anyway, that part of my surgery seems very similar to an LCL reconstruction that you are scheduled for. The allograft ligament is just placed further to the back to control the hyperextension; whereas the LCL is placed on the side to control the varus force (or bowing of your knee).
Your rehab, of course, will depend on your surgeon's protocol, and formal PT will depend on how diligent you are at home or if you have access to a gym. I plan to just check in every few weeks to progress my program. I'm told ~3-4 months before I can return to my job that requires me to stand/walk all day. 9-12 months for light recreational activity. This is my general post-op info: 4 wks NWB, slow progression to full wt bearing by 8 wks, long leg post-operative brace locked at 10 degrees, and then longterm use of a functional brace to control stress on the new ligament. My lateral incision is about 4 1/2 inches. An achilles allograft was used. I was told the surgery time was 5 hours (also incorporated the ACL and peroneal nerve decompression though). I'm sure there are many variations in repair techniques, protocols, and experiences. I'm sure you know that maximizing your strength and flexibility pre-operatively is key.
Something also to consider is your general limb alignment. I've read a frequent cause of LCL failure is not addressing varus malalignment. Did your surgeon do full leg X-rays to determine your weight bearing line? Over time, chronic injuries such as yours, can lead to exaggerated varus deformity. Hope some of this is helpful to you. KP