Marvel’s Avengers is available to play from today. Since it has a single-player campaign, here’s how long it will take to beat it. Lots of people are simply asking: how long is Marvel’s Avengers game? Here you’ll discover the estimated campaign length so you can gauge how long it will take to beat. Thor, Captain America, Black Widow, Ms. Marvel, Hulk, and Iron Man are available heroes from the get-go, but rumors hint that Black Panther and She-Hulk could be added in the future. We also know that Spider-Man will be exclusive to Sony, meanwhile, Kate Bishop has been confirmed.…