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That's a good estimate from MookietheBold. For the first playthrough seemed a lot longer. Some of the darker areas took roughly forever, especially when I was having trouble figuring out what to do next.
After a dozen or so playthroughs I can zip through the whole game, including sidequests, in about six hours, give or take. It's always fun to hear the dialog and zoom the vehicles around.
Jove the Sleep Depraved. Primal Wiki: http://primal.wikia.com