Getting to level 99 only takes a few hours, and the most that's required from you is leaving and re-entering a room every few minutes. Still boring, though. I don't remember what level I was at when I fought Gilgamesh; I do remember that it was really hard, however. You should at least see his introduction.

All the courier does here is knock lightly, wait a second, and run off. They don't even notice our doorbell. I think they're on a tight schedule, but it still sucks to have them gone by the time you get to the door. -_-