being an expert at this particular benchmark I can assure you a 37min 10k would be much harder than a 1 hour 40k, assuming you are as much of an aero geek as me.

I am certain I will break the hour for 40k this year while still training the run

I don't know that i will ever do a 37min 10k even if I only ran.

But if you have the 'average' triathlete equipment and position, those two benchmarks may be just about right.

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter