"Anything longer than six months" is a silly assertion to make. If a team gives up after a paltry six months, they never had the willpower to succeed in the first place.
Graphical MUDs take years to complete, and graphical technology is far more susceptible to obselescence than text technology.
18-24 months is extremely reasonable before opening for beta testing, though it really depends on how many skilled man-hours are put in during that time.
--matt
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