Alpha Protocol Preview

The folks at PS3 Attitude have conjured up a short Alpha Protocol preview after receiving a hands-on demonstration at this week's GamesCom event. 100 hours to see everything sounds good to me:
How you load your character out determines how you play through that mission. If you choose gadgets and weapons that require stealth, you are required to play through the mission without being detected. Load up with guns and grenades, and you can cause merry havoc.

There are also several factions within the game and a range of different people you can align with to ensure your experience of Alpha Protocol is different from other people. You won't be able to complete every single mission in one play-through (which will take you around 30 hours), so if you want to play everything you are going to need around 100 hours of spare time.