It depends on how quick you fight. Me myself can finish both the prelude to war and WW3 in 5 hours.
72 hours
3 Hours
About 6-7 hours on normal.
It takes about 9 hours to complete The Saboteur.
Around 20 hours.
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it took me about 9 hours, but i have played portal 1.
How many hours will it take to get from Arizona to Washington DC?
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"How many hours does it take to drive from D.C. to Miami?" 18 hours. Best wishes
12-15 hours if your 100%ing it