https://www.trainingpeaks.com/training-plans/running/ultra/tp-208461/12-week-ultimate-ultramarathon-training-plan-7-15hrs-finishing-time
Can I run an ultramarathon on only 3 days a week YES you can. Not every aspiring ultra runner has unlimited time to train. The 12 week three-four day
ultramarathon trainingweekultimateplanfinishing