is there a limit of list items displayed on mega menus?

So I've redesigning this web that has a lot of menus (> 100 menus total in my app). Is there a limit of list items displayed on mega menus?

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and what should be the best behavior for "See More" button on mega menu? I've been thinking it should go to list of menus page, but I'm afraid it won't show a lot of menu and other menu isn't discoverable by users.

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Thank you.

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