It's the same system used in FFXI to an extent. I can tell you that I can log in and out pretty quickly other than hitting the potential 3102 error. Without that roadblock I could theoretically force DC...wait out an annoying damage mechanic (re: PLUMES) and log back in. Could even force DC to dodge aggro in a dungeon potentially. Therefore the game holds your session active for a few minutes ensuring that not only can you not get back in immediately but that you take the damage you would otherwise have been able to cheat your way around taking.