Too much traveling involved and it takes too much time to get anywhere. Unless you have a helicopter but that's very rare and if you play by yourself, chances are, you'll be bored to death. You more or less need a buddy or a squad to play it with. I played for 2 weeks straight but after you completed everything (get every top gear there is) it gets rather stale and all that's left is to hunt other players. Which is even more time consuming.
It's a great game, I was addicted to it for a while, but it just takes way too much time to do anything. Fun if you got 5-6 hours of free time. You can't really do anything in an hour in DayZ. I probably won't be able to play it for a while due to a job and classes starting again.