ntext
Variable-length Unicode data with a maximum length of 2^30 - 1 (1,073,741,823) characters. Storage size, in bytes, is two times the number of characters entered. The ISO synonym for ntext is national text.
Variable-length non-Unicode data in the code page of the server and with a maximum length of 2^31-1 (2,147,483,647) characters. When the server code page uses double-byte characters, the storage is still 2,147,483,647 bytes. Depending on the character string, the storage size may be less than 2,147,483,647 bytes.
For more you can check following threads:
ntext, text, and image [ ^ ]
char and varchar [ ^ ]
Hope it helps. The limit is 2gb. To overcome this you can use the filestream feature. The filesystem used must (of course) not be FAT32 because you would then reintroduce this limit. check out this link: http://msdn.microsoft.com/en-us/library/cc949109%28v=sql.100%29.aspx [ ^ ]
Good luck!

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