Maximum size of Pattern space / Hold space

"JDF" <[email protected]>
Newsgroups gmane.editors.sed.user
Message-ID <[email protected]> 
Hello all,
I am using GNU sed 4.2.1 on Fedora 14.
Does anyone know what the maximum size of the Pattern/Hold spaces
can be?  If I did many, many N or H commands, could I overflow them?
Thanks!
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