I have the same injury about 15 years ago playing football.
In retrospect it was a pretty straightforward injury, with a clean break in the tib and spiral in the fib, but at the time it was tough. I think I was in full cast for 14 weeks total.
When I came out of cast I was walking with a stick for a couple of weeks until the strength came back. I was, however, out on the bike pretty much straight away, even when struggling to walk. With it being non-load bearing it was really useful for getting the strength back in the leg. IIRC, it took about a month before I could do any light jogging, and then another month or so before I was sprinting.
I broke my leg mid January and was playing football again for the start of the next season so say end of August.
The fitness is difficult to get back but it will come. My advice would be not to push yourself and try and do too much too soon. I foolishly tried too much and ended up with associated issues with my ankle as it has also weakened during the 3-4 months out of action.
Best of luck pal, hope it goes OK.