The Major Occultation, according to Shia, is Hujjat-Allah al-Mahdi's second occultation after the Minor Occultation. According to Twelvers, the Major Occultation which came around the year 329AH/941CE is still in effect, and will not end until the end of time when the Mahdi returns to reestablish justice on earth.

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https://en.wikipedia.org/wiki/Major_Occultation

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