public String getPreferredMaintenanceWindow() {
        return this.preferredMaintenanceWindow;
    }
<p>
Specifies the weekly time range during which maintenance on the cluster is performed. It is specified as a range
in the format ddd:hh24:mi-ddd:hh24:mi (24H Clock UTC). The minimum maintenance window is a 60 minute period.
</p>
<p>
Valid values for <code>ddd</code> are:
</p>
<ul>
<li>
<p>
<code>sun</code>
</p>
</li>
<li>
<p>
<code>mon</code>
</p>
</li>
<li>
<p>
<code>tue</code>
</p>
</li>
<li>
<p>
<code>wed</code>
</p>
</li>
<li>
<p>
<code>thu</code>
</p>
</li>
<li>
<p>
<code>fri</code>
</p>
</li>
<li>
<p>
<code>sat</code>
</p>
</li>
</ul>
<p>
Example: <code>sun:23:00-mon:01:30</code>
</p>

@return Specifies the weekly time range during which maintenance on the cluster is performed. It is specified as
        a range in the format ddd:hh24:mi-ddd:hh24:mi (24H Clock UTC). The minimum maintenance window is a 60
        minute period.</p>
        <p>
        Valid values for <code>ddd</code> are:
        </p>
        <ul>
        <li>
        <p>
        <code>sun</code>
        </p>
        </li>
        <li>
        <p>
        <code>mon</code>
        </p>
        </li>
        <li>
        <p>
        <code>tue</code>
        </p>
        </li>
        <li>
        <p>
        <code>wed</code>
        </p>
        </li>
        <li>
        <p>
        <code>thu</code>
        </p>
        </li>
        <li>
        <p>
        <code>fri</code>
        </p>
        </li>
        <li>
        <p>
        <code>sat</code>
        </p>
        </li>
        </ul>
        <p>
        Example: <code>sun:23:00-mon:01:30</code>
aws-java-sdk-elasticache/src/main/java/com/amazonaws/services/elasticache/model/Snapshot.java