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According to Theravada, one can reach full enlightenment as a lay person. Tradition holds that once one reaches full enlightenment, one ordains within 7 days or passes away.
There have been some threads about this, search for "lay arahant" or "arahant 7 days ordain" and it might show the previous threads. For me, it makes sense as in lay life one can still practice, make progress, but once there is full awakening, the lay life wouldn't be able to support full mindfulness all the time, equanimity, non-use of money, etc.