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

@return The weekly time range, in Universal Coordinated Time (UTC), during which system maintenance can occur.
aws-java-sdk-redshift/src/main/java/com/amazonaws/services/redshift/model/Cluster.java