Update build.xml

Set to 14 day validity window

build.xml

@@ -109,7 +109,7 @@
     -->
 
     <!-- Default validUntil duration for all generated metadata, in days. -->
-    <property name="validUntil.default.days" value="21"/>
+    <property name="validUntil.default.days" value="14"/>
 
     <!-- Specific validUntil duration for aggregates, in days. -->
     <property name="validUntil.aggregate.days" value="${validUntil.default.days}"/>