Last of Us. Took about 18 hours to complete, though I only played it for an hour or so at a time. Also beat the Left Behind DLC afterward in about an hour.
Prior to that I had completed Mass Effect 3.
My gaming backlog is unfortunately quite large. AC series, half a dozen racing games, Beyond Two Souls, GTA5, and many more.
I keep buying games even though i rarely have time to play them
