information_schema.domains.character_maximum_length

Note:

If the domain has a character or bit string type, the declared maximum length; null for all other data types or if no maximum length was declared.

Note:

If the domain has a character or bit string type, the declared maximum length; null for all other data types or if no maximum length was declared.

Note:

Maximum length, in characters, for binary data, character data, or text and image data. -1 for xml and large-value type data. Otherwise, NULL is returned. For more information, see Data Types (Transact-SQL).