public String getPreferredMaintenanceWindow() {
        return this.preferredMaintenanceWindow;
    }
<p>
The weekly time range during which system maintenance can occur, in Universal Coordinated Time (UTC).
</p>
<p>
<i>Format</i>: <code>ddd:hh24:mi-ddd:hh24:mi</code>
</p>

@return The weekly time range during which system maintenance can occur, in Universal Coordinated Time (UTC).</p>
        <p>
        <i>Format</i>: <code>ddd:hh24:mi-ddd:hh24:mi</code>
aws-java-sdk-docdbelastic/src/main/java/com/amazonaws/services/docdbelastic/model/Cluster.java