Good luck. Do you have a plan to increase your distances and prepare?
Yes - will be the same approach as I've used before to build up distance - my longest run in my current sequence is 13.5 miles, so I will aim to do 15, 18, 21 in consecutive weeks, ease off for a week or two, and then do 21 and a marathon, mostly on trails from home, then take a two week break and go for it.
My legs will tell me if its working. Usually with the plan above, they feel OK up to the previous longest distance and then tighten up. It's a formula that got me round the Dorset Coast Ultra (70km), Manhood Peninsula (50km around the coast of Selsey cutting across the top using the Chichester Canal) and Dartmoor Winter Crossing (South Brent - Okehampton - 50km in January).
The main unknown is how my dodgy toes will hold up. The special inserts in my shoes seem to work well so far. I plod more, rather than rolling on my toes, but that seems to keep my pace more consistent, although about 20 seconds per kilometre slower than pre-injury.
Time estimates are less of a goal and more of a planning aid - how much liquid to carry in a Camelbak and the amount of calories to carry in my bumbag.