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Hi - Can anyone give a guess as to how much longer an offroad forest marathon would take compared with a "normal" road marathon?
The Oslo forest marathon is coming up very shortly. This is run of XC ski trails, dirt roads, fire trails in forest, and the like. Up and down somewhat, but not gigantic hills. I wondered if anyone with experience of similar marathons could give a guess or their experience on how much longer such marathons take. I'm finding it tricky to estimate my time, and I like to program a Forerunner target time to run against. If, for example, I'm in form to run an ordinary mara in 4:00, what would you say: 4:20, 4:30? Thanks for any tips or opinions.