Encourage one another and build one another up. Pray without ceasing. Test everything. Keep what is good. Avoid all evil. -1 Thess 5:11,17,21,22
40 miles per day is pretty ambitious for people with cheap shoes. It can be done, but generally not by people who are not young and in very good shape.
I 100% agree. I think 15 miles a day is doable on a day-after-day basis. Even with that bogey there will be attrition.