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
Around 20 hours.
It takes about 9 hours to complete The Saboteur.
About 6-7 hours on normal.
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it took me about 9 hours, but i have played portal 1.
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How many hours will it take to get from Arizona to Washington DC?
"How many hours does it take to drive from D.C. to Miami?" 18 hours. Best wishes
several hours