MediaWiki:Apihelp-userrights-param-expiry

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Expiry timestamps. May be relative (e.g. 5 months or 2 weeks) or absolute (e.g. 2014-09-18T12:34:56Z). If only one timestamp is set, it will be used for all groups passed to the $1add parameter. Use infinite, indefinite, infinity, or never for a never-expiring user group.