No DRM or Copy Protection has ever in the history of computer games survived uncracked for more than a few days!
Assassin's Creed II on the PC was released around the start of March 2010, but a working crack was only available at the end of April. Prince of Persia: The Forgotten Sands on the PC was released on 12 June 2010, and the crack released on 28 June 2010. That is a bit more than a few days.
Consoles are different story of course. They last much much longer relatively speaking before they are cracked.