Document link: https://docs.redhat.com/ja/documentation/red_hat_enterprise_linux/9/html/using_systemd_unit_files_to_customize_and_optimize_your_system/proc_changing-the-timeout-limit_assembly_working-with-systemd-unit-files 

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In this document says "specify the TimeoutStartUSec value in the [Service] section",
but "specify the TimeoutStartSec value in the [Service] section" is correct

> 2. /etc/systemd/system/httpd.service ファイルを開き、[Service] セクションに TimeoutStartUSec 値を指定します。