Not before a thousand years!
Not before 500000 years!
 “I swear by my True Self, all manifestations have come to an end by this Most Great Manifestation (meaning Bahā’u’llāh). Whoever claims (to be a manifestation) after that is a slandering liar,” Bahā’u’llāh, Iqtidārāt wa chand lauḥ dīgar, p. 327.
 “The Dispensation of Bahā’u’llāh will last until the coming of the next Manifestation of God, Whose advent will not take place before at least ‘a full thousand years’ will have elapsed,” Bahā’u’llāh, The Kitābi Aqdas, p. 195.
 `Abdu’l-Bahā uses the word cycle to refer to dispensation: “. . . in the first manifestation the sun will stop in the middle of the sky for ten days, in the second manifestation twenty days and in the third manifestation thirty days. Know that the first manifestation in this report is the manifestation of his Highness the Messenger (meaning Prophet Muḥammad) in which the sun of reality stopped for ten days in that constellation and every day is equal to one century and by this calculation [those ten days] are a thousand years and that was the Muḥammadan cycle and cycle (daur and kaur) [!] . . . the second manifestation, was the manifestation of the Primal point, may my soul be sacrificed for him, in which the Sun of Truth stopped in that cycle (daur) for twenty years . . . in the cycle (daur) of the blessed beauty . . . whose length will be at least 500000 years . . .” `Abdu’l-Bahā, Makātīb (Egypt), vol. 2, pp. 75–76.