The Form Guidelines field (under the Forms tab ---> Edit Form / Create New Form form --> General Settings tab) has a 12,000 character limit. Note that you won't be able to save your new form or save changes to the existing form if the text in your Form Guidelines exceeds the character limits.

The Organization Profile General Guidelines field (under More --> Account )  has a 13,000 character limit. Note that you will encounter an error message if the text in your guidelines exceeds the character limits.

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