A tweet from DOOM (cue ominous music) responds to a question about the length of the single-player campaign in DOOM, id's upcoming shooter reboot (thanks The Escapist). Word is: "@Unreal389 The difficulty level plays a factor, but folks playing at the office average 13+ hours in the campaign." For those unafraid of spoilers and interested in more details on the game, a post on the Doomworld Forums (thanks DSOGaming) has a bunch of information supposedly data-mined from the DOOM alpha that reveal unannounced characters and other tidbits about to expect when DOOM returns in May.