For my 1st Ironman (CAman) which I did after racing one 1/2 IM, my 36 week training load was:
Swim 26 Miles
Bike 2012
Run 511
I ended up going just under 13 hours at 12:59 on a fairly fast course but it was very windy (30 mph+) and hot (90+) and the bike course was 8 miles long. Race no longer an option as it is no longer being held.
My 2nd Ironman (IMAZ), which I did after dislocating both shoulder 2 years earlier, 36 week training load was:
Swim 16 Miles
Bike 1310
Run 421
My time showed the low training, it really was all I could handle at the time due to various personal reasons and the shoulder injuries: 13:09. I wasn’t a big fan of the course to be honest. 3 loops on the Bike and the Run was brutal. It was also hot and windy. This was my least favorite of the 3 IMs I have done.
My 3rd Ironman (Vineman), I got serious about, except for the swim hehe, and did the following 36 week load:
Swim 12 Miles (all in the last 8 weeks)
Bike 2635
Run 670
Doubling my bike and 1.5X my run really helped my time and even with lower swim training I was able to pull off a 1:12 swim with a total time of 10:35. I really liked the course, and the wind heat wasn’t too bad last year. My favorite of the 3 courses I have done.
I am currently training for IM CDA and hope to qualify for Kona. I am 17 weeks into my program and here is my current load with projected totals:
Swim 58 Miles (Projected: 100)
Bike 1369 (Projected: 3500)
Run 396 (Projected: 900)
I am currently averaging about 12 hours pw, though that will jump to 15-18 (18 only for a few weeks) very shortly and will persist till I start tapering 3 weeks out from the race. I have a career that takes ~ 50-60/week on the job and am married (going on 16 years) and have 2 kids (13 & 7). I am finding that ~15 hours per week is the absolute maximum time I have to give to training and that includes waking up at 4:30-5AM every morning and often willing to train until till 10 PM to get it done.
I am not sure how others can give 20+ with professional careers. I could in theory add maybe another ~3 hours to my week if I counted walking (2 miles per day) and my daily bike commute (~10 miles round trip), but I don’t consider those activities “training” since they are done at a leisurely pace.
I would say if you can give around 8 hours pw to training you can finish assuming you’re in reasonable shape. I would spend the majority of that time on your bike, which is going to be the killer your 1st time at this distance. Whats left should be spent running, with just 1 or 2 sessions of ~1500 yards in the pool per week. Prior to the race, maybe 3 or 4 weeks out, do a longer open water swim at ~2 miles so you feel comfortable with the distance and then don’t sweat it. As long as you can swim the 2 miles straight without resting or having to switch strokes, you’ll make the cut off easy. Something like the below schedule would work:
Mon - Run 8-10 (2 hour run)
Tues - Ride 50-60 (3 hour ride)
Wed - Off
Thurs - Run 3-4 (30 min run)
Fri - Ride 10-20 (1 hour ride)
Sat - Run 3-4 (30 min run)
Sun - swim 1,500 (30 min swim)
Total = 7.5 hours
If you started next week, your training load would be for a 25 week cycle:
Swim: 21 miles
Bike: 1500 (assuming minimum)
Run: 350 (assuming minimum)
This is a light enough load that even with your schedule you could fit them in. The one area of concern would be your long ride per week. The irony here is given the light load, the long ride becomes the absolute cornerstone of this program. You miss it, you’re really going to jeopardize your chances of success. I would say this program is more in line for a 1/2 IM but will get you across the finish line for a full-IM as well. If anything has to give, drop your swim workout, until about 8 weeks out from the race. Do the long ride and run every week.