Well I've only had Minecraft for about four months now (360 Edition). And I don't play single player; at least not really because I almost always have friends joining my world and playing. We all build our own stuff though.
Time wise the longest I've been on one map was my first map (which due to my noobiness was more of a testing map). I was on that for about three months. However, the map I am on now I've only been on for a little over a month and I've spent more hours in it than the other one. I plan on being on the current map for a very long time since my plans for that map are going to take forever.







