public void setPreferredMaintenanceWindow(String preferredMaintenanceWindow) {
        this.preferredMaintenanceWindow = preferredMaintenanceWindow;
    }
<p>
Specifies the weekly time range during which maintenance on the DAX cluster is performed. It is specified as a
range in the format ddd:hh24:mi-ddd:hh24:mi (24H Clock UTC). The minimum maintenance window is a 60 minute
period. Valid values for <code>ddd</code> are:
</p>
<ul>
<li>
<p>
<code>sun</code>
</p>
</li>
<li>
<p>
<code>mon</code>
</p>
</li>
<li>
<p>
<code>tue</code>
</p>
</li>
<li>
<p>
<code>wed</code>
</p>
</li>
<li>
<p>
<code>thu</code>
</p>
</li>
<li>
<p>
<code>fri</code>
</p>
</li>
<li>
<p>
<code>sat</code>
</p>
</li>
</ul>
<p>
Example: <code>sun:05:00-sun:09:00</code>
</p>
<note>
<p>
If you don't specify a preferred maintenance window when you create or modify a cache cluster, DAX assigns a
60-minute maintenance window on a randomly selected day of the week.
</p>
</note>

@param preferredMaintenanceWindow
       Specifies the weekly time range during which maintenance on the DAX cluster is performed. It is specified
       as a range in the format ddd:hh24:mi-ddd:hh24:mi (24H Clock UTC). The minimum maintenance window is a 60
       minute period. Valid values for <code>ddd</code> are:</p>
       <ul>
       <li>
       <p>
       <code>sun</code>
       </p>
       </li>
       <li>
       <p>
       <code>mon</code>
       </p>
       </li>
       <li>
       <p>
       <code>tue</code>
       </p>
       </li>
       <li>
       <p>
       <code>wed</code>
       </p>
       </li>
       <li>
       <p>
       <code>thu</code>
       </p>
       </li>
       <li>
       <p>
       <code>fri</code>
       </p>
       </li>
       <li>
       <p>
       <code>sat</code>
       </p>
       </li>
       </ul>
       <p>
       Example: <code>sun:05:00-sun:09:00</code>
       </p>
       <note>
       <p>
       If you don't specify a preferred maintenance window when you create or modify a cache cluster, DAX assigns
       a 60-minute maintenance window on a randomly selected day of the week.
       </p>
aws-java-sdk-dax/src/main/java/com/amazonaws/services/dax/model/CreateClusterRequest.java