Warren Doyle suggests these paces at
www.warrendoyle.com. They seem reasonable to me:
southern 421 miles of the AT are 50% uphill and 50% downhill.
Springer to Watauga Dam Road
6 months = 8-12 miles per day 5 months = 10-15 miles per day
The next 1,340 miles of the AT are 33% uphill, 33% downhill, and 33% level.
Watauga Dam Road to Glencliff, NH
6 months = 14-18 miles per day 5 months = 15-20 miles per day
The next 215 miles of the AT are 50% uphill and 50% downhill
Glencliff, NH to Flagstaff Lake
6 months = 8-12 miles per day 5 months = 10-15 miles per day
The northern 170 miles of the AT are 33% uphill, 33% downhill, and 33% level.
Flagstaff Lake to Katahdin
6 months = 12 – 15 miles per day 5 months = 15-20 miles per day