exactly what quad says, plus then there is the BS formula:|
Hours per playtrough times playtroughs, times games.
100 x 2 x 2 = 400 hours
well, I just asumed, Demon souls takes about as long as dark souls.
I'm really going for everything, trying to get all the trophies. It motivates me, that the trophies automatically make me have awesome stuff. so it can be a grind, but not just for the *bling* of the trophy, but also for the cool gameplay-tools you the have.
So I am close to the end of my first playtrough, and I think I will probably need more or less 100 hours until I can kill gwyn and have pretty much every trophy that is possible in the game.
I then have to do a second playtrough, and because of the boss weapons, probably even a third. but of course I will be faster on the next playtroughs because I don't need many hours for things I needed in the first playtrough. So I think 200 hours for dark souls is probably correct for the trophy.
Me for myself, I don't have the goal for the platinum, if it happens goof, if not, oh well, I just want to enjoy the game as long as i do, and also I want to play the dlc, even if there aren't any trophies and stuff, but up until now achieving the trophies was good fun, once that stops and I had enough I will just quit and play something else.