system.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <section id="system">
            <tab>advanced</tab>
            <group id="bulk" translate="label" showInDefault="1" showInWebsite="0" showInStore="0" sortOrder="600">
                <label>Bulk Actions</label>
                <field id="lifetime" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="0" showInStore="0">
                    <label>Days Saved in Log</label>
                </field>
            </group>
        </section>
    </system>
</config>