--- a/heuristics/metadataHeuristics.php
+++ b/heuristics/metadataHeuristics.php
@@ -1,3 +1,12 @@
-      - duplicated description
-        - most duplicated overall, most duplicated per agency/category/supplier etc.
-  
+ <?php
+ /*- duplicated description
+        - most duplicated overall, most duplicated per agency/category/supplier etc. */
+   $heuristics["METADATA_DUPLICATED_DESCRIPTION"] = Array(
+	"description" => "unusual value for time of year");
+function METADATA_DUPLICATED_DESCRIPTION($cn)
+{
+    	$averageContractPeriod = getAverageContractPeriod();
+	$diff = strtotime($cn['contractStart']) - strtotime($cn['publishDate']);
+	$days = intval($diff / 24);
+	return ($days > 45 ? 1 : 0);
+}