I think the best way to imagine the journey is as if it's a mountain you have to climb. The worst part for me was when I was told by my doctor to stop lengthening. I was extremely mentally and spiritually exhausted, the pain was the worst, and I had very few friends visiting since I was so isolated.
Right after surgery, you'll have medicine, food, and be allowed to rest for as long as you need. The first few weeks, you'll be doing PT, but it won't be anything that feels too painful. After a month or two, the pain from PT gets horrible. The pain from stretching isn't something I can describe accurately in words. It feels like all of your tendons, nerves, and muscles are being ripped from inside. The worst pain was during the 4th month when I finished lengthening. I had 6-8 hours of PT everyday (either at home or with my PTs), and cried almost everyday from the pain.
Once I stopped lengthening, the pain started getting better slowly but surely. I still had a lot of anxiety about when I'll be able to get my ankle flat and my legs straight again, but in a few weeks time, I saw improvement almost everyday. Now I'm in my consolidation phase (month 7), and I've started using my walker to go to the gym and walk a little more. My physical and mental pain is a lot better than what it was a few months ago.
TL;DR - On a 10 month timeline after surgery, worst pain is around the 4-5 month mark.