When do you plan on quitting? When you run outta money? When the inflation gets too horrible to stand? Or do you have a specific set of goals that you'd like to achieve before calling it quits?
All I really want from this game is to get my WHM and SMN to 75 and AF armor for each and Rank 10 in Windy and Sandy (not so concerned with Asstok). And I want to participate in a few end game stuff like Dynamis and then... I'm done.
Those are the main things I want to accomplish in FFXI so once those things are done, I'll be happy to "end" the game and say that I'm done. This is one of those games that you can't really beat completely since it just keeps going and there's always more to do. But you can set some goals for yourself, and once reaching them, be able to say that you finished what you wanted to finish in Vanadiel.
Arrakis teaches the attitude of the knife — chopping off what's incomplete and saying: "Now it's complete because it's ended here."