public ModifyDBClusterRequest withPreferredMaintenanceWindow(String preferredMaintenanceWindow) {
        setPreferredMaintenanceWindow(preferredMaintenanceWindow);
        return this;
    }
<p>
The weekly time range during which system maintenance can occur, in Universal Coordinated Time (UTC).
</p>
<p>
Format: <code>ddd:hh24:mi-ddd:hh24:mi</code>
</p>
<p>
The default is a 30-minute window selected at random from an 8-hour block of time for each Amazon Region,
occurring on a random day of the week.
</p>
<p>
Valid Days: Mon, Tue, Wed, Thu, Fri, Sat, Sun.
</p>
<p>
Constraints: Minimum 30-minute window.
</p>

@param preferredMaintenanceWindow
       The weekly time range during which system maintenance can occur, in Universal Coordinated Time (UTC).</p>
       <p>
       Format: <code>ddd:hh24:mi-ddd:hh24:mi</code>
       </p>
       <p>
       The default is a 30-minute window selected at random from an 8-hour block of time for each Amazon Region,
       occurring on a random day of the week.
       </p>
       <p>
       Valid Days: Mon, Tue, Wed, Thu, Fri, Sat, Sun.
       </p>
       <p>
       Constraints: Minimum 30-minute window.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-neptune/src/main/java/com/amazonaws/services/neptune/model/ModifyDBClusterRequest.java