If I am playing and then have to step "AFK", so to speak, for any length of time (such as to eat dinner - anything where I am still in the house), I simply put my PS4 into Rest Mode (which is such a great feature!). I would think that Rest Mode suspends the in-game clock, so you don't get another hour of total game time tacked on. I think the same would go for simply pausing the game by pressing Start/Options/Esc.