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18th July 2020 at 3:21pm

Your configuration tiddler itself just needs to contain the text 200 (or whatever number of characters you want to show). To use the value on your filter, the easiest method is:

{{{ [<wikitext>split[]first{$:/config/LinkExcerptLength}join[]] }}}
Go to question: Ex:ExcerptConfigurationTiddler