I consider myself a healthy adult and I think 2 days for 18 miles sounds commendable.
The amount of elevation change does matter, too. I am talking about both the difference between the trip elevation and his normal living elevation as well as the total elevation change within those 18 miles.
The amount of elevation change does matter, too. I am talking about both the difference between the trip elevation and his normal living elevation as well as the total elevation change within those 18 miles.