Less than 5 hours a week, so there is no option for me.
But also it depends. As for example when the next Zelda or Uncharted game will be released, I will play it all my free-time until it is finished. So easily 5-10 hours per day, depending on weekend or working-day, but the game(s) will be finished after a few days, if I don't try to collect every single items and upgrades(which I never do).
So in a week described as above, easily 40-50 hours. I think even Zelda games are stated to contain 50 hours of gameplay, so it seems reasonable.
Last week I played 0 hours. Perhaps 1 hour of gameplay for the whole week if I really really stretched it for my whole gameplay time on my smartphone.