I clear my tabs as soon as I'm done with the app or whatever I'm using, so I never have more than 2-3 open, and that's if I am using all of them, like playing an app game, and talking to people in messenger and texts...
Only about 5 at a time, I like to clear my tabs often if it goes over 5 but I switch between the few that I use so it rarely does. How on earth do you guys deal with having so many open at once??? My phone (and my organisation obsession) would explode!