I ride bikes, lots. No training. My bikepacking is usually 8 hrs or so per day, depends. 30 -50 miles for mixed terrain like dirt and singletrack with some paved thrown in. My " plan " might change 2-3 times per day. I do try to have at least 1-2 nights stay planned out. Weather, legs, hills all come into play. Much of my touring is in New England, I sort of know the lay of the land. Rids with GPS is great for elevation and such. I usually add 1 hr and 10 miles for whatever I plan on a map. Eat early, eat often and start pedaling early. Never pass up a good lunch, even if it's 11 am. Be resourceful, talk to the locals, and take advantage of whats around you. Such as a great swimming hole, the diner that smells awesome, campers next to you with huge an mounts of food, seasonal fruits and veggies.