public String getPreferredMaintenanceWindow() {
        return this.preferredMaintenanceWindow;
    }
<p>
A range of time when maintenance of DAX cluster software will be performed. For example:
<code>sun:01:00-sun:09:00</code>. Cluster maintenance normally takes less than 30 minutes, and is performed
automatically within the maintenance window.
</p>

@return A range of time when maintenance of DAX cluster software will be performed. For example:
        <code>sun:01:00-sun:09:00</code>. Cluster maintenance normally takes less than 30 minutes, and is
        performed automatically within the maintenance window.
aws-java-sdk-dax/src/main/java/com/amazonaws/services/dax/model/UpdateClusterRequest.java