Yes Benkbeny, you can receive as many merits as possible on a particular post, look for yourself how many merits was received in this post (1), and in this one (2).

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The only limitation in sending merits is a member can't send merits to themselves, lol, a member can't also send more than 50 merits to a particular member within 30 days and a member can't send merits in a section that they have ignored.