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The shorter the distance used to predict a longer event the more likelihood it'll be a fair bit out.
Slower 5km × 8.5 times will be challenging without miles in legs.
Given the v.limited info above I'd suggest running with 4hr pacer not 3.30 and push on in last 10km only if legs are feeling up to it.
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The Runners World marathon time calculator puts my time (based off a 5k) at 3:16
It'd be better to put a HM time into the calculator.
When is the marathon? If you feel you have the aerobic fitness there, then concentrate on time on feet, 3hr + runs or something, as slow as you like. Your body needs to adapt and condition to the stresses - At the 3hr mark, I was barely in a sweat, but my body hurt...
I'm in the same boat as Hats, first marathon coming up and the furthest I've ever run is just over a half marathon (running for two hours then stopping).
I was planning on going out and simply aiming to run for three hours, see where that got me to - I would expect around 30km, maybe slightly more.
Does this hold water as a plan to de-fear the marathon? The Runners World marathon time calculator puts my time (based off a 5k) at 3:16 for Stockholm, so my plan was to tuck in behind the 3:30 pacer and run within my abilities, as it were.