I’m considering Ultraman Canada at some point in the future. The race is in august and I plan on doing Kona and IMAZ after that. I’m trying to figure out recovery time from that double marathon. Based on my experience to date, I find that my weekly run volume seems to be the biggest factor in recovery time. If I had to guess, I’d estimate that I need to have several months at about 90 miles per week, in order for the ultraman run to not take a huge toll and put me in a deep hole.
Do you think that volume is enough?
I know it’s a long way out, but I’m thinking about it now because it has an implication on what other races I do.
You can look at this a bunch of different ways, I didn’t do it but crewed and coached an athlete this year. I know you do testing, so the first thing we looked at with her post testing was how many calories could she handle on the bike, at that point we knew at program start that nutrition would not be an issue (she was “efficient” enough) unlike IM the day to day requirements are a lot less, and you have good recovery time between days to get Cals back up, massage etc.
So the idea was to focus more intensity on the bike, IMO you can handle a higher output on the 2 cycling days as you don’t have to run after. For the run we focused not so much on speed, but “durability” IIRC the longest planned run was 60km but only turned out to be 53km. We went over Marathon distance only twice, the UMC course is also about 60km or 3/4 gravel road….not a trail but a softer surface than say Kona UM.
Think of it as a hard stage race with a long run on day 3 
We also looked at a few selective shoe sections/changes, Hoka’s were a bit hot on her, but we did change to them for the last 20km downhill sections.
Also I would say 90mpw is huge, the biggest weeks here were only about 90km. Often 70-80km. But heavy focus on cycling, (big rides, but also more intensity than you might think)
Swim was a bit more than a normal IM athlete, IIRC twice at 7-8km….nothing too crazy.
Recovery will depend a lot on what you do in the second half of the run……or how hard you go out on the first half, It is also very hot……we stopped and set up aid every 1km……You need a really good crew plan, which she set up and was thinking about months in advance.
**Edit: depends on the athlete but a very rough run predictor would be 2XIM run plus 30 minutes (or so)
Maurice