In an interview with German site PS3 Insider, Ubisoft senior producer Marie-Jo Leroux revealed Driver: San Francisco will take about some 10-12 hours, but with 130 more activities, that game time will expand a ton.
Leroux stated, "If one follows only the main plot and throttle, it takes probably between ten and 12 hours for playing through. If you make the extra missions - what one should do, because you can unlock it with the repurchased will power vehicles and improvements - we will of course take much longer."
Driver: San Francisco will be released this September for PC, Xbox 360 and PlayStation 3. Check out Strategy Informer's preview here.