See upstream README file for configuration and usage instruction. Almost all information from that file is relevant. However, from the section "INSTALLATION", only this is relevant: * Edit a file like e.g. /etc/request-tracker4/RT_SiteConfig.d/90-local.pm and add the line: Plugin('RT::Extension::ElapsedBusinessTime'); * Clear your mason cache rm -rf /var/cache/request-tracker4/mason_data/obj * Restart your webserver -- Andrew Ruthven Mon, 19 Feb 2019 09:38:28 +0000