Old relic quest used to be a lot tougher ( lower chance drops from fates, having to kill 10 of each enemy for the book part instead of three, drops at the end of the dungeon weren't guaranteed so you'd spend the whole day farming a single item, and the amount of light gathered per dungeon was lower I think.)

Do a little each day and you can have it done in a month I think. It can probably be done in 10 days if you can push ( and also if you've got some crafting friends to help you with that part, or at least the gil to buy the items yourself.)