Considering there is one piece of exotic armor, and if you are lucky enough for it to be your helmet, you can have all of the rest of the Legendary armor in two weeks. 65 Crucible marks per item. 100 - 65> 35 135 - 65> 70 70 - 65> 5 Then you can start saving up for your weapons. Not entirely sure why the helmets are the only armor part at 120 Marks though..