Board Thread:Community Decisions/@comment-24909831-20170817161658/@comment-3055683-20170817210207

Actually, if you paid strict attention to the details of the book, it said that the Indomitus Crusade lasted approximately one century, which equals 100 years. If it began after the events of the Fall of Cadia in 999.M41, that would place it approximately at ~100.M42. Following the Battle of the Pit of Raukos, that is when Guilliman declared the official end of the Indomitus Crusade and the disbandment of the Unnumbered Sons so that he could take part in the Plague Wars still going in in his own Realm of Ultramar.