Go to 4.2b on the main Ts and Cs page:
https://www.marriott.com.au/loyalty/...fault.mi#elite
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4.2.b. To achieve or renew Elite membership status, the following number of Elite Night Credits (“Minimum Requirement”) must be earned through (i) nights stayed at Participating Properties or (ii) Marriott Bonvoy Events between January 1 and December 31 of any given year: