OK
From 2-6-2005 post http://www.zbrushcentral.com/showthread.php?23640-A-method-for-exceeding-ZB-s-4096-document-limit&highlight=largest+canvas+size
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I created a document in an external paint program to a size of 4096X8192.
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Save it as a jpeg, and import it into the texture pallet.
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Press the Crop and fill button in the texutre pallet.
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Check your document size.
I tried this out and ZB4R4p2 loaded a document 9000 x 6600 (22"x30") but would not create a document this way at 12000 x 12000 - it would load it into the texture but crashed when I crop to fill as document.
So what is the limit of the document size in ZB4R4p2?