public String getPreferredMaintenanceWindow() {
        return this.preferredMaintenanceWindow;
    }
<p>
The weekly time range during which system maintenance can occur, in Universal Coordinated Time (UTC).
</p>
<p>
Uses the format <code>&lt;day&gt;:HH:MM-&lt;day&gt;:HH:MM</code>.
</p>
<p>
For the day values, use <code>mon</code>|<code>tue</code>|<code>wed</code>|<code>thu</code>|<code>fri</code>|
<code>sat</code>|<code>sun</code>.
</p>
<p>
For example, <code>sun:09:32-sun:10:02</code>.
</p>

@return The weekly time range during which system maintenance can occur, in Universal Coordinated Time (UTC).</p>
        <p>
        Uses the format <code>&lt;day&gt;:HH:MM-&lt;day&gt;:HH:MM</code>.
        </p>
        <p>
        For the day values, use <code>mon</code>|<code>tue</code>|<code>wed</code>|<code>thu</code>|
        <code>fri</code>|<code>sat</code>|<code>sun</code>.
        </p>
        <p>
        For example, <code>sun:09:32-sun:10:02</code>.
aws-java-sdk-securityhub/src/main/java/com/amazonaws/services/securityhub/model/AwsRdsDbClusterDetails.java