I am plugged in most of the time that I am not at work. When I am at work, I only check texts if I get them and answer an occasional phone call. Once I leave work, I tend to plug in to find out what is going on in the world. Because I am not plugged in at work, I found out about both Sandy Hook and the Boston Marathon via social media after work.
I don't consciously set aside offline time. Starting this week, my husband has stated no electronics until we get some housework done, dishes, laundry, dinner started, homework, etc. It has proven to be a good strategy because once he plugs in, I don't see any reason to do work because he is not helping out. It is really annoying at restaurants when I am trying to get myself and the kids not to use electronics and he pulls out his phone to check scores/play games. I finally got to the point of if you can't beat them, join them. Kids and I still limit ourselves during the meal itself though.
I find that if I am into a really good book, I will be offline more. I have seen it with my kids also. Tonight, my daughter read for 90 minutes because we went to the library and she found a new series of books that she really likes.