Pretty neat. I wish there was something similar for PlayStation as there'd be a lot more to look at.
Same company has a PS stie https://www.truetrophies.com/ but I think part of the issue is they were not tracking at the beginning? They also tend to be a bit behind the Xbox site for these things so I would say sign up there and its possible the pull the data and provide this sort of thing.
That TWD S2 completion at 92 minutes is weird, must have been because I did the last episode on the first day of the year? Fallout 3 is so spread out because I rented it and then bought the GOTY edition later on.
For the Telltale games, episode 1 is considered the "base" game and all the others are DLC, because that's the way the data is categorized by XBL. So that's your completion time for episode 1.