diff --git a/config.php.in b/config.php.in
index 8f33fb7..ff2a749 100644
--- a/config.php.in
+++ b/config.php.in
@@ -40,6 +40,7 @@
 $config['EXTERNAL_DASHBOARD_URL'] = '';
 
 $config['SESSION_EXPIRY'] = 3600;
+$config['DELTA_INDEXER_PERIOD'] = 1800;
 
 $config['ENABLE_SAAS'] = 0;
 $config['CAPTCHA_FAILED_LOGIN_COUNT'] = 0;
diff --git a/webui/model/health/health.php b/webui/model/health/health.php
index 738cdf7..5867e56 100644
--- a/webui/model/health/health.php
+++ b/webui/model/health/health.php
@@ -231,7 +231,7 @@
 
          $st = stat(INDEXER_BEACON);
          $t1 = date(DATE_TEMPLATE . " H:i", $st['mtime']);
-         $t2 = date(DATE_TEMPLATE . " H:i", $st['mtime']+30*60);
+         $t2 = date(DATE_TEMPLATE . " H:i", $st['mtime']+DELTA_INDEXER_PERIOD);
 
          $data = array($t1, $t2);
       }