I had been on a few trekking holidays before I started fell running including a ten day walk around the TMB. The consensus on these treks was you can walk yourself fit in a week or ten days (well, considerably fitter than when you started)
Training for the BG with a MM rucksack and plenty of kit (like a pacer basically) and then being let off the lease for your attempt is a massive boost. The only thing is carrying bag spoils your form and some 'proper' running is needed too I think
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