Just finished Shovel knight specter of torment campaign. While i found it interesting to play through, it felt shorter than the other campaigns. I spent 13 and a half hours on shovel knight's campaign(standard), 15 and a half hours on plague knight's campaign(standard), and only a short 5 and half hours on Specter Knight's campaign(standard). I didn't finish all of the collectibles on any of them, though i did try to get a majority of them.