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I don't think there's a limit. Since curses can only be destroyed by other curses, I feel like that outlines pretty well that they don't actually fade with time. Not to mention cases like Cursed Objects, Sukuna's especially, that just gets stronger with time instead of fading away even though Sukuna himself isn't a cursed spirit so he can't be the collective fear of anything nor can he be collecting something like ambient cursed energy.I don't remember cursed energy being eternal. Curses exists as along as humans exists but there is a limit to it. So his technique should work on Mahito. Beside even if it doesn't be can still target soul and negs him.