GreyLord
Legend
Not exactly an RPG, but it can be as long as one (or some of them, longer than some, but not as long as the longest ones).
When using SFB as the way to run the battles in the game, Federation and Empire is pretty darn long and complicated.
Haven't tried some of those listed in the thread (synnbar, FATAL) but did run Rolemaster. MERP/Rolemaster/ICE? is probably the most complex RPG I've run. Eclipse Phase is purportedly complex, but I've never actually read the rules deep enough to run it, just read the books for fun more than to play.
When using SFB as the way to run the battles in the game, Federation and Empire is pretty darn long and complicated.
Haven't tried some of those listed in the thread (synnbar, FATAL) but did run Rolemaster. MERP/Rolemaster/ICE? is probably the most complex RPG I've run. Eclipse Phase is purportedly complex, but I've never actually read the rules deep enough to run it, just read the books for fun more than to play.