How long is the campaign in Gears of War E-Day?

If you're curious how long the Gears of War: E-Day campaign is, you're not alone. As explained in our review, this is one chunky Gears of War game, and it's non-stop action all the way through. E-Day is set during Emergence Day, aka the moment the Locust Horde invaded Sera, which means that all of humanity is caught by surprise, scrambling to defend themselves.