See this thread for appropriate research regarding your question

Well played.

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2020 National Masters Champion - M40-44 - 400m IM
Canadian Record Holder 35-39M & 40-44M - 200 m Butterfly (LCM)

As most folks doing OD or IM will have the same time during the week the main difference will be the length of the Long ride and Run, the rest of the training will be pretty similar.

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http://www.tri-monkey.co.uk

IM training has SAME volume and hours but:
Longer long runs
Longer long rides
Longer hard rides
Tempo run might be easier
Swim speed work might be easier

That seems to be what I did when I trained form IMLT 2013

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Dave Campbell | Facebook | @DaveECampbell | h2ofun@h2ofun.net

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Well, per an earlier response... it probably starts with defining what you consider "elite"

I'm going to stay out of the whole argument about what an elite AGer is or isn't. But happy to share how I approach OD and IM distances as A priority races. My hours per week are pretty much set. 14hrs a week for me is about the max I can ever do and the average is closer to 10-12. So my goal is always just to get into the best shape I can with the time I have. That means a focus on intensity, because for me I wouldn't be introducing enough stress in a week to create an adaptation. I should add, that I started as a bike racer almost 30 years ago - so I have the benefit of having many years as a base. I don't have time to do lots of long distance stuff. So the only real change is that I negotiate a couple days with the fam to cram in 3-4 extra long days in the 6 weeks leading up to an IM. By long days, I mean 6+ hrs zone 2 & 3. It's not perfect, but I find that if I'm OD fit, I can do an IM. In my opinion, there's almost no difference training for OD and 70.3.

The other thing I'll say is that even OD is a 2hr race. So from an aerobic standpoint these races are all very similar. The big difference I think is the jump in muscular fatigue that happens with IM. Whenever I've done IM, my legs die. I haven't done it, but I think it makes sense (and research would back this up) that strength training could really help. Traditionally, with a time crunch I've believed that you'll get the most bang for your time training sticking to the sport you're training for. But for my next IM, I plan to incorporate strength training this time around.