Or maybe something like You've watched this TV Show for 347 days !

Take the first ever watched episode vs the last one watched (even if multiple views)

I find it interesting to note the value of the "Days" column in my list on MAL. Some shows (like, 13-episode anime, nothing the length of Uchuu Kyoudai or whatever) took me well over 1000 days to finish, and that's impressive in a slightly depressing way. It'd be neat if Trakt surfaced that kind of information.

I am an incurable stats nerd.

I would enjoy having something like 'It took you 154 days to finish this show'.
Basically it would calculate the difference between the first ever watched episode and the latest one (that makes it 100%). It could be tricky tho. What happens if you watched an other episode after reaching 100% ? And surely we can't count on only checking the first episode and the latest one since you don't always watch them in the correct order (not all the tv shows require it)

That's exactly what I was looking for. +3

yes, that's what i meant

How long in calendar days? Something like you started in January 2013 and it too until October 2013 to watch a season?