50 minutes sounds about right for me. Saying it's a time suck is a bit like saying the internet is a time suck, though. It's a tool and it depends how you use it. I try to avoid arguing over stupid political memes with friends-of-friends who I don't know. I keep up with friends and family, I participate in the mustache group, a philosophy group, a fitness group...there are definitely potential pitfalls (most notably hearing a lot of news stories only through my liberal-slanted group of acquaintances) and the site isn't designed to be useful or help you use your time effectively, but I figure it's about as wasteful as watching TV so I just make sure it's one or the other rather than both and that I'm comfortable with the amount of time spent altogether. I'm sorry if all y'all choose to friend people who post stupid shit, but you can curate your feed.