You might need to consider that an army moves much slower than an individual when it comes to carting all the food and equipment required. I doubt your average RPG hero needs to feed thousands of people each day as well as build a Roman Fort at the end of each day's march.
Perhaps you could go for a walk 1 weekend and see how far you can get in 4-5 hrs?
Perhaps you could go for a walk 1 weekend and see how far you can get in 4-5 hrs?