Logback Keep n Days Logs With Size Based Archiving

I'm trying to configure logs rolling policy for a java web application. Here is what I have so far

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${LOG_HOME}/appLog.%d{yyyy-MM-dd HH}.%i.log.gz
            </fileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy
                class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>500MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
            <maxHistory>7</maxHistory>
            <cleanHistoryOnStart>true</cleanHistoryOnStart>
        </rollingPolicy>

What I'm trying to achieve here is to keep all the logs for the past 7 days, but compress log files whenever they reach 500MB.

Logback configuration shown above keeps only last 7 files, so if there are lot of logs, I can have 7 files only for the last day, for example.

How can I configure logback in this case to keep all logs for the past 7 days? Any help is really appreciated.