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

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