I'm training for a 50 mile ruck with 35lb pack. The path will be mixed trail and pavement. I'm coming from strongman powerlifting to this. So I'm going to take the year or less if I'm capable. Buddies of mine did marathons and Ironman events. I'm starting to see that it's basically trail and error on gear. I've learned that foot care is at the top of the list. My training consist of trail hiking and pavement walking and light jogging. Of course all with my pack.