I have now found enough thorough journal keepers at trailjournals.com for Southbound AT thru-hikes to feel it is worthwhile to publish some preliminary data for that group -- 39 of them from the hiker classes of 2002 through 2012.
TABLE 1 -- Mean Days to Complete Each Section
MEAN DAYS~TOTAL DAYS~~SECTION
16.4 days...........16.4 days.........Katahdin to Stratton
10.7 days...........27.1 days.........Stratton to Gorham
10.3 days...........37.4 days.........Gorham to Glencliff
22.5 days...........59.9 days.........Glencliff to Kent
11.9 days...........71.8 days.........Kent to Delaware Water Gap
16.4 days...........88.2 days.........Delaware Water Gap to Harpers Ferry
9.7 days............97.8 days..........Harpers
...
I used the GIS information available at the ATC site to create a map of major state parks and forests that touch the AT. This map has clickable links. A couple of things to say about it.