It's like an off and on thing for me. When I use my laptop, it won't even take an hour straight. I'd usually log out when I close the browser tab for facebook. This is the same when I use my mobile phone, although I think I spend more time in my phone than my laptop. I don't do much in facebook. I'd just check my timeline to see what's currently going on with people. I rarely post photos or videos also. And, I don't stalk people and visit their profiles whatsoever. So, there's nothing much to be done.