In reply to goldmember:
If you put some long days in, you can get ready for the 80km in April. Step up the distance gradually, focus on hours rather than miles so you don't try and push the pace.
It would be a massive leap to do the 193km in April 2016 from where you are now, but 2017, why not?
You need to do lots of steady running on the type of terrain you want to race focus on staying injury free and learn to eat (and what to eat) as you run.
Best thing to do would be join a running club and meet lots of other people who have done similar things.