I will be hiking with my nine year old son & friends. He made the climb to Lake of the clouds from the Highland center last August. If we take the 2.7 mile trek to Greenleaf on Thursday 8/21 to Galehead 8/22 to Zealand 8/23 ending at the Highland Center 8/24 over a 4 day period will he make it? We will be meeting his cousin Jake at Greenleaf (works the hut) & this is why we are adding an additional day. Also, is the total distance around 21 miles?