Talk:Randuin's Omen/@comment-91.44.110.163-20121228121043/@comment-68.109.110.108-20130122070547

It's 1 second for 100 armor, and 1 second for 100 MR. So if you have 100 armor and 100 MR, it's +2 seconds. If you doubt that, just buy it in a game and check.