Anno 1404 - 27 hours - Me and a friend no lifed a weekend when we weren't working. That game is fucking hard to play late game. By the end I had several active trading routes, like 5 passive sell ports, 3 specialist orient islands, 2 manufacturing Occident islands, and one main city island. Had to take over an AI just to horde all the fertilities I needed. Not to mention having to deal with annoying corsairs.
Minecraft - 18 hours - Me and same friend went legit and created various egyptian structures, and a giant upside down glass pyramid.
Minecraft - 14 hours - Me and same same friend played through an extended CTM map.
Age of Mythology - 11 hours - Me and aforementioned friend Created our own highly inefficient cities for no reason other than for it to look nice.