This isn't really the same thing, but I sliced through (not really ruptured, it was a clean cut) the extensor hallucis longus tendon in my right foot about 10 months ago. Right now I have about 80% of the function in that foot back. Looking to get closer to 99.9% over the next year or so. There might be some stuff in my story that could help you, so here goes.
1) Connective tissue heals VERY slowly. My tendon was fully knitted after about ten weeks, but the one you've injured is thicker, so my guess is it will be longer. I don't know about that though. Really the best thing you can do to help the process is take care of yourself - managing nutrition, sleep, stress levels etc. It pays to keep a closer eye on all those things than you might normally.
2) One thing I did in the beginning that I think helped was doing as much moving and weight bearing around the injury as felt safe. I was in a cast for 2 weeks and then a moonboot for about 3 months. During the moonboot period I started gently moving the toe and standing on it a few minutes a day. Obviously you need to be careful and your situation may well warrant a longer period of complete immobility, but I was conscious that connective tissue strength is lost if you don't stress it, and the longer I left the reintroduction of that stress, the harder it would be.
3) If you can afford it/ your insurance will cover it, get yourself a decent physio and do what they tell you. I can't tell you how much that helped me.
4) Massage the injury and the surrounding area to break down some of the scar tissue. This is really good for improving range of motion. Just be careful in the early stages that you're not causing more damage.
5) Walking and standing oddly for weeks and months together wreaks havoc on your biomechanics. Seven months after dispensing with the moonboot I'm still having problems with my hips and my back slipping out of alignment because I held them consistently at weird angles for so long. They're much better now than they were at the start, but pretty much all the improvements I've seen have been over the last couple of months. Before that I just felt like I was spinning my wheels. My ways of addressing the problem are basically a heap of foam rolling and stretching, along with my physio's making adjustments every ten days or so. And I try not to sit for long periods, because that seems to be the real killer.
Some of this stuff is really just common sense, so I apologise if I'm just repeating what you already knew. Also, I'm not a medical professional of any sort and none of the above should be taken as gospel. I'm just sharing what's worked for me. Standard disclaimers apply.
Anyway, sorry for the length, but I hope some of it helps. Feel free to ask any questions you have. Good luck dude.