The last day is actually easy. The second day could be a killer, but I plan to assess myself when I get to Island Pond. See the attached schedule.
Note - The mileage start and end numbers are for the 2009 AT I found online.
Also, I've downloaded the GPX files for this hike from Backpacker/Trimble Outdoors and had a spreadsheet calculate the elevation gain/loss and the "GPS" distance. This data is in the last 3 columns. I use this information to gauge the difficulty of a planned day. I'm such a geek.