The first one is from Mahoosuc Notch, the "most difficult or fun mile of the whole AT". I guess it depends on your mood, or how much pond water you've ingested. I tackled it in the morning, so I had a pretty good time going through this pit of boulders; I was able to jump over gaps that I would have had to take my pack off to get through otherwise. It took me nearly an hour and a half to get to the other side.
The Notch is famously difficult, but the trail before and after is pretty tough, too!