Well it will take a long time, regardless of whether you get all of the atma tomorrow, or a year from now. I just unlocked the first book of the quest, and it requires a good deal of completion. I hope everyone gets a little lucky in the days and weeks to come, because this is a great deal of work for a lvl 100 weapon. I know that there is a good chance that the zodiac upgrade will be well worth the effort so all i can say is to stick it out if you really want it. Take breaks from time to time and just enjoy the rest of 2.2.....Hell I haven't Even fought Gilgamesh, or Leviathan, finished the new main story quests or even learned to dance the Manderville.