I don't know why people mention how much replay is in a game as if it's so easily obvious. Everyone has different paces, so there's not nine or nine hundred hours of gameplay in Assassin's Creed, only as much as you play it until boredom kicks in which could be any time. I completed Assassin's Creed yesterday, I finished every single free mission and reached every single 'reach high' point in the game during my play through. I played the game for seven hours straight on the day I bought it, and back then I only had one of my targets assassinated. So my experience lasted a lot longer than nine hours, but that's my experience and my pace.