What is it global banner? You mean announced banner, or some script from look and feel panel.
As I know, In Confluence don't have any rule for block to edit for 6 hour Announced or side wide banner.
There is an announcement banner add-on which provides a banner, so if you're using that, it might be in there.
But as Gonchik says, if you've done a banner the standard way in Confluence, with the html in the header, there is absolutely no code to stop you editing it as soon as you want.
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